Base class wich contains all the stuff to build a Wave Table Synth. Not for use directly.

+ Inheritance diagram for MidiPlayerTK.MidiSynth:

Public Types

enum  ModeSpatializer { Channel , Track }

Public Member Functions

int MPTK_ChannelBankGetIndex (int channel)
int MPTK_ChannelCount ()
bool MPTK_ChannelEnableGet (int channel)
void MPTK_ChannelEnableSet (int channel, bool enable)
int MPTK_ChannelForcedPresetGet (int channel)
bool MPTK_ChannelForcedPresetSet (int channel, int preset, int bank=-1)
string MPTK_ChannelInfo (int channel)
int MPTK_ChannelNoteCount (int channel)
bool MPTK_ChannelPresetChange (int channel, int preset, int bank=-1)
int MPTK_ChannelPresetGetIndex (int channel)
string MPTK_ChannelPresetGetName (int channel)
float MPTK_ChannelVolumeGet (int channel)
void MPTK_ChannelVolumeSet (int channel, float volume)
void MPTK_ChorusSetDefault ()
void MPTK_ClearAllSound (bool destroyAudioSource=false, int _idSession=-1)
void MPTK_InitSynth (int channelCount=16)
void MPTK_ResetStat ()
void MPTK_ReverbSetDefault ()
void MPTK_SFChorusSetDefault ()
void MPTK_SFFilterSetDefault ()
void MPTK_SFReverbSetDefault ()
void MPTK_StartSequencerMidi ()
void MPTK_StopSynth ()
IEnumerator MPTK_WaitAllNotesOff (int _idSession=-1)
delegate void OnAudioFrameStartHandler (double synthTime)

Public Attributes

bool MPTK_ApplyModLfo
bool MPTK_ApplyRealTimeModulator
bool MPTK_ApplySFChorus
bool MPTK_ApplySFFilter
bool MPTK_ApplySFReverb
bool MPTK_ApplyVibLfo
bool MPTK_AudioSettingFromUnity
bool MPTK_AutoBuffer = true
int MPTK_AutoCleanVoiceLimit
bool MPTK_CorePlayer
float MPTK_CutOffVolume = 0.05f
bool MPTK_DirectSendToPlayer
bool MPTK_EnableChangeTempo
bool MPTK_EnableFreeSynthRate = false
bool MPTK_EnablePanChange
bool MPTK_EnablePresetDrum
bool MPTK_KillByExclusiveClass = true
float MPTK_LeanSynthStarting = 0.05f
bool MPTK_LogWave
bool MPTK_ReleaseSameNote = true
uint MPTK_ReleaseTimeMin = 500000
float MPTK_ReleaseTimeMod = 1f
bool MPTK_ResetChannel = true
float MPTK_SFChorusAmplify
float MPTK_SFFilterFreqOffset = 0f
float MPTK_SFReverbAmplify
bool MPTK_SpatialSynthEnabled
int MPTK_StatVoiceCountActive
int MPTK_StatVoiceCountFree
int MPTK_StatVoicePlayed
float MPTK_StatVoiceRatioReused
bool MPTK_WeakDevice
EventSynthClass OnEventSynthAwake
EventSynthClass OnEventSynthStarted
Action< MPTKEventOnMidiEvent
bool playOnlyFirstWave

Static Public Attributes

static List< MidiFilePlayerSpatialSynths


bool MPTK_ApplyUnityChorus [get, set]
bool MPTK_ApplyUnityReverb [get, set]
float MPTK_ChorusDelay [get, set]
float MPTK_ChorusDepth [get, set]
float MPTK_ChorusDryMix [get, set]
float MPTK_ChorusRate [get, set]
float MPTK_ChorusWetMix1 [get, set]
float MPTK_ChorusWetMix2 [get, set]
float MPTK_ChorusWetMix3 [get, set]
int MPTK_IndexSynthBuffSize [get, set]
int MPTK_IndexSynthRate [get, set]
string MPTK_InstrumentPlayed [get]
bool MPTK_IsSpatialSynthMaster [get]
bool MPTK_KeepPlayingNonLooped [get, set]
float MPTK_MaxDistance [get, set]
bool MPTK_PauseOnDistance [get, set]
float MPTK_ReverbDecayHFRatio [get, set]
float MPTK_ReverbDecayTime [get, set]
float MPTK_ReverbDelay [get, set]
float MPTK_ReverbDensity [get, set]
float MPTK_ReverbDiffusion [get, set]
float MPTK_ReverbDryLevel [get, set]
float MPTK_ReverbHFReference [get, set]
float MPTK_ReverbLevel [get, set]
float MPTK_ReverbLFReference [get, set]
float MPTK_ReverbReflectionDelay [get, set]
float MPTK_ReverbReflectionLevel [get, set]
float MPTK_ReverbRoom [get, set]
float MPTK_ReverbRoomHF [get, set]
float MPTK_ReverbRoomLF [get, set]
float MPTK_SFChorusDepth [get, set]
float MPTK_SFChorusLevel [get, set]
float MPTK_SFChorusSpeed [get, set]
float MPTK_SFChorusWidth [get, set]
float MPTK_SFFilterQModOffset [get, set]
float MPTK_SFReverbDamp [get, set]
float MPTK_SFReverbLevel [get, set]
float MPTK_SFReverbRoomSize [get, set]
float MPTK_SFReverbWidth [get, set]
bool MPTK_Spatialize [get, set]
int MPTK_SpatialSynthIndex [get]
int MPTK_SynthRate [get, set]
string MPTK_TrackName [get]
int MPTK_TransExcludedChannel [get, set]
int MPTK_Transpose [get, set]
float MPTK_Volume [get, set]


OnAudioFrameStartHandler OnAudioFrameStart

Detailed Description

Base class wich contains all the stuff to build a Wave Table Synth. Not for use directly.

Load SoundFont and samples, process midi event, play voices, controllers, generators ...
This class is inherited by others class to build these prefabs: MidiStreamPlayer, MidiFilePlayer, MidiInReader.
It is not recommended to instanciate directly this class, rather add prefabs to the hierarchy of your scene.

[MPTK PRO] class extension pro

Member Enumeration Documentation

◆ ModeSpatializer

[MPTK PRO] Spatializer Mode for the prefab MidiSpatializer


Spatial Synth are enabled to dispatch note-on by channels.
As a reminder, only one instrument at at time can be played by a MIDI channel
Instrument (preset) are defined by channel with the MIDI message MPTKCommand.PatchChange


Spatial Synth are enabled to dispatch note-on by tracks defined in the MIDI.
As a reminder, multiple channels can be played on a tracks, so multiple instruments can be played on a Synth.
Track name are defined with the Meta MIDI message SequenceTrackName. This MIDI message is always defined in MIDI, so name can be missing.

Member Function Documentation

◆ MPTK_ChannelBankGetIndex()

int MidiPlayerTK.MidiSynth.MPTK_ChannelBankGetIndex ( int  channel)

Get the current bank associated to the channel.
Each MIDI channel can play a different preset and bank.

channelMIDI channel must be between 0 and 15

◆ MPTK_ChannelCount()

int MidiPlayerTK.MidiSynth.MPTK_ChannelCount ( )

Get channel length. The midi norm is 16, but MPTK can manage up to 32 channels (experimental).

channelmust be between 0 and 15
channel count

◆ MPTK_ChannelEnableGet()

bool MidiPlayerTK.MidiSynth.MPTK_ChannelEnableGet ( int  channel)

Is channel is enabled or disabled.

channelchannel, must be between 0 and 15
true if channel is enabled

◆ MPTK_ChannelEnableSet()

void MidiPlayerTK.MidiSynth.MPTK_ChannelEnableSet ( int  channel,
bool  enable 

Disable (mute) or enable (unmute) a MIDI channel.

channelmust be between 0 and 15
enabletrue to unmute (default), false to mute channel

◆ MPTK_ChannelForcedPresetGet()

int MidiPlayerTK.MidiSynth.MPTK_ChannelForcedPresetGet ( int  channel)

Set forced preset on the channel. MIDI will allways playing with this preset even if a MIDI Preset Change message is received.
Set to -1 to disable this behavior.

preset index, -1 if not set
int preset = midiFilePlayer.MPTK_ChannelForcedPresetGet(channel);
int bank = midiFilePlayer.MPTK_ChannelBankGetIndex(channel);
GUILayout.Label($"{preset} / {bank}");
int forcedPreset = (int)GUILayout.HorizontalSlider(preset, -1f, 127f);
if (forcedPreset != preset)
midiFilePlayer.MPTK_ChannelForcedPresetSet(channel, forcedPreset);

◆ MPTK_ChannelForcedPresetSet()

bool MidiPlayerTK.MidiSynth.MPTK_ChannelForcedPresetSet ( int  channel,
int  preset,
int  bank = -1 

Set a Preset on a channel to force the MIDI Synth to always playing with this instrument even if MIDI 'Preset Change' or 'Bank change' messages are received.
Set Preset to -1 to restore the Preset and Bank defined in the MIDI file.

channel0 to 15 channel
presetPreset to force in the range 0 to 127 preset. Set to -1 to restore the Preset and Bank known from the MIDI file.
bankOptionnal. Bank to force in the range 0 to 128. Set to -1 to restore to the last bank known from the MIDI file.
true if the preset/bank exists in the current SoudFont, otherwise false
// Example of changing the forced preset with the Unity GUI.
// ---------------------------------------------------------
int preset = midiFilePlayer.MPTK_ChannelPresetGetIndex(channel);
// Slider to change the preset on this channel from -1 (disable forced) to 127
// The forced bank is defined from the inspector.
int forcePreset = (int)GUILayout.HorizontalSlider(preset, -1f, 127f);
if (forcePreset != preset)
// Force a preset whatever the MIDI events from the MIDI file.
midiFilePlayer.MPTK_ChannelForcedPresetSet(channel, forcePreset);

Another example with MidiExternalPlayer.

// To force the preset from the start of the playing,
// the forced preset and the forced bank must be set
// after the MIDI is loaded and before any MIDI message is played.
// The OnEventStartPlayMidi event is perfect for that.
// ---------------------------------------------------------------
// Get the prefab added to the hierarchy of the current scene
MidiExternalPlayer midiPlayer = FindObjectOfType<MidiExternalPlayer>();
// Set the listener on the event OnEventStartPlayMidi
midiPlayer.OnEventStartPlayMidi.AddListener((string midiName) =>
// Each time the MIDI is started this script is run
// Force preset 70 for note-on on channel 0 (Bassoon is GM SoundFont)
midiPlayer.MPTK_ChannelForcedPresetSet(0, 70, 1);
[MPTK PRO] Play a Local MIDI file or from a Web site. This class must be used with the prefab MidiExt...
Definition: MidiExternalPlayer.cs:35
EventStartMidiClass OnEventStartPlayMidi
Definition: MidiFilePlayer.cs:625
bool MPTK_ChannelForcedPresetSet(int channel, int preset, int bank=-1)
Definition: MidiSynth.cs:1967

◆ MPTK_ChannelInfo()

string MidiPlayerTK.MidiSynth.MPTK_ChannelInfo ( int  channel)

Build an information string about the channel. It's also a good pretext to display an example of Channel API.
Exemple of return

  • Channel:2 Enabled [Preset:18, Bank:0] 'Rock Organ' Count:1 Volume:1
  • Channel:4 Muted [Preset:F44, Bank:0] 'Stereo Strings Trem' Count:33 Volume:0,50
channelindex channel
Information string
GUILayout.Label("Channel Preset Preset / Bank Count Enabled Volume", myStyle.TitleLabel3);
for (int channel = 0; channel < midiFilePlayer.MPTK_ChannelCount(); channel++)
// Display channel number and log info
if (GUILayout.Button($" {channel:00}", myStyle.TitleLabel3, GUILayout.Width(60)))
// Display preset
GUILayout.Label(midiFilePlayer.MPTK_ChannelPresetGetName(channel) ?? "not set", myStyle.TitleLabel3, GUILayout.MaxWidth(150));
// Display preset and bank index
string sPreset = "";
int presetForced = midiFilePlayer.MPTK_ChannelForcedPresetGet(channel);
if (presetForced == -1)
// Preset not forced, get the preset defined on this channel by the Midi
sPreset = midiFilePlayer.MPTK_ChannelPresetGetIndex(channel).ToString();
sPreset = $"F{presetForced}";
int bankIndex = midiFilePlayer.MPTK_ChannelBankGetIndex(channel);
GUILayout.Label($"{sPreset} / {bankIndex}", myStyle.LabelRight/*, GUILayout.Width(80)*/);
int current = midiFilePlayer.MPTK_ChannelPresetGetIndex(channel);
// Slider to change the preset on this channel from -1 (disable forced) to 127.
// Forced bank from the inspector.
int forcePreset = (int)GUILayout.HorizontalSlider(current,
-1f, 127f, myStyle.SliderBar, myStyle.SliderThumb, GUILayout.Width(100));
if (forcePreset != current)
// Force a preset and a bank whatever the MIDI events from the MIDI file.
// set forcePreset to -1 to restore to the last preset and bank value known from the MIDI file.
// let forcebank to -1 to not force the bank.
midiFilePlayer.MPTK_ChannelForcedPresetSet(channel, forcePreset, forceBank);
// Display count note by channel
GUILayout.Label($"{midiFilePlayer.MPTK_ChannelNoteCount(channel),-5}", myStyle.LabelRight, GUILayout.Width(60));
// Toggle to enable or disable a channel
GUILayout.Label(" ", myStyle.TitleLabel3, GUILayout.Width(60));
bool state = GUILayout.Toggle(midiFilePlayer.MPTK_ChannelEnableGet(channel), "", GUILayout.MaxWidth(20));
if (state != midiFilePlayer.MPTK_ChannelEnableGet(channel))
midiFilePlayer.MPTK_ChannelEnableSet(channel, state);
Debug.LogFormat("Channel {0} state:{1}, preset:{2}", channel, state, midiFilePlayer.MPTK_ChannelPresetGetName(channel) ?? "not set"); /*2.84*/
// Slider to change volume
float currentVolume = midiFilePlayer.MPTK_ChannelVolumeGet(channel);
GUILayout.Label($"{Math.Round(currentVolume, 2)}", myStyle.LabelRight, GUILayout.Width(40));
float volume = GUILayout.HorizontalSlider(currentVolume, 0f, 1f, myStyle.SliderBar, myStyle.SliderThumb, GUILayout.Width(60));
if (volume != currentVolume)
midiFilePlayer.MPTK_ChannelVolumeSet(channel, volume);

◆ MPTK_ChannelNoteCount()

int MidiPlayerTK.MidiSynth.MPTK_ChannelNoteCount ( int  channel)

Get count of notes played since the start of the MIDI.

channelmust be between 0 and 15

◆ MPTK_ChannelPresetChange()

bool MidiPlayerTK.MidiSynth.MPTK_ChannelPresetChange ( int  channel,
int  preset,
int  bank = -1 

Change the Preset and/or Bank associated to a Channel.
The new value of the bank or preset are registered in the channel even if the preset or bannk is not found.
Each channel can have a different bank/preset set.
Note 1: When bank is changed, the preset list is not updated (MidiPlayerGlobal.MPTK_ListPreset). Call MidiPlayerGlobal.MPTK_SelectBankInstrument to refresh this list.
Note 2: When playing a MIDI file, MIDI messages like "Patch Change" and "ControlChange BankSelectMsb" will override value registered with this method.
Note 3: To change globally the bank, use instead the global methods: MidiPlayerGlobal.MPTK_SelectBankInstrument or MidiPlayerGlobal.MPTK_SelectBankDrum.
Note 4: The method MPTK_ChannelForcedPresetSet can be used to force the preset whatever the MIDI messages.

// Change bank or preset with free value with MPTK_ChannelPresetChange
// -------------------------------------------------------------------
// Select any value in the range 0 and 128 for the bank
int bank = (int)Slider("Free Bank", midiStreamPlayer.MPTK_ChannelBankGetIndex(StreamChannel), 0, 128, false, 100, 200);
// Select any value in the range 0 and 127 for the preset
int prst = (int)Slider("Free Preset", midiStreamPlayer.MPTK_ChannelPresetGetIndex(StreamChannel), 0, 127, true, 100, 200);
// If user made change for bank or preset ...
if (bank != midiStreamPlayer.MPTK_ChannelBankGetIndex(StreamChannel) ||
prst != midiStreamPlayer.MPTK_ChannelPresetGetIndex(StreamChannel))
// ... apply the change to the MidiStreamPlayer for the current channel.
// If the bank or the preset doestn't exist
// - the method returns false
// - the bank and preset are still registered in the channel
// - when a note-on is received on this channel, the first preset of the first bank is used to play (usually piano).
bool ret = midiStreamPlayer.MPTK_ChannelPresetChange(StreamChannel, prst, bank);
// Read the current bank, preset and preset name selected
int newbank = midiStreamPlayer.MPTK_ChannelBankGetIndex(StreamChannel);
int newpreset = midiStreamPlayer.MPTK_ChannelPresetGetIndex(StreamChannel);
string newname = midiStreamPlayer.MPTK_ChannelPresetGetName(StreamChannel);
Debug.Log($"MPTK_ChannelPresetChange result:{ret} bank:{newbank} preset:{newpreset} '{newname}'");
channel0 to 15. There is 16 channels available in the MIDI norm.
presetThe total number of presets available depend on the soundfont selected
bankOptionnal, if not set or -1 the current bank will be applied (or default bank if never set). Default bank is defined globally: menu MPTK / SoundFont Setup.
true if the bank and the preset were found else false

◆ MPTK_ChannelPresetGetIndex()

int MidiPlayerTK.MidiSynth.MPTK_ChannelPresetGetIndex ( int  channel)

Get channel preset index.

channelmust be between 0 and 15

◆ MPTK_ChannelPresetGetName()

string MidiPlayerTK.MidiSynth.MPTK_ChannelPresetGetName ( int  channel)

Get the current preset name for the channel.
Each MIDI channel can play a different preset.

channelMIDI channel must be between 0 and 15

◆ MPTK_ChannelVolumeGet()

float MidiPlayerTK.MidiSynth.MPTK_ChannelVolumeGet ( int  channel)

Get the volume of the channel

channelmust be between 0 and 15
volume of the channel, between 0 and 1

◆ MPTK_ChannelVolumeSet()

void MidiPlayerTK.MidiSynth.MPTK_ChannelVolumeSet ( int  channel,
float  volume 

Set the volume for a channel as a percentage.

channelmust be between 0 and 15 or -1 to apply to all channels
volumepercentage of volume from the global volume for the channel, must be between 0 and 1

◆ MPTK_ChorusSetDefault()

void MidiPlayerTK.MidiSynth.MPTK_ChorusSetDefault ( )

[MPTK PRO] Set Chorus Unity default value as defined with Unity.

◆ MPTK_ClearAllSound()

void MidiPlayerTK.MidiSynth.MPTK_ClearAllSound ( bool  destroyAudioSource = false,
int  _idSession = -1 

Clear all sound by sending note off.
That could take some seconds because release time for sample need to be played.

if (GUILayout.Button("Clear"))
destroyAudioSourceusefull only in non core mode
_idSessionclear only for sample playing with this session, -1 for all (default)

◆ MPTK_InitSynth()

void MidiPlayerTK.MidiSynth.MPTK_InitSynth ( int  channelCount = 16)

Initialize the synthetizer: channel, voices, modulator.
It's not usefull to call this method if you are using prefabs (MidiFilePlayer, MidiStreamPlayer, ...).
Each gameObjects created from these prefabs have their own, autonomous and isolated synth.

channelCountNumber of channel to create, default 16. Any other values are experimental!

◆ MPTK_ResetStat()

void MidiPlayerTK.MidiSynth.MPTK_ResetStat ( )

Reset voices statistics

◆ MPTK_ReverbSetDefault()

void MidiPlayerTK.MidiSynth.MPTK_ReverbSetDefault ( )

[MPTK PRO] Set Reverb Unity default value as defined with Unity.

◆ MPTK_SFChorusSetDefault()

void MidiPlayerTK.MidiSynth.MPTK_SFChorusSetDefault ( )

[MPTK PRO] Set Chrous SoundFont default value as defined in fluidsynth.
FLUID_CHORUS_DEFAULT_LEVEL 2.0 but set to 0.9 (thank John)

◆ MPTK_SFFilterSetDefault()

void MidiPlayerTK.MidiSynth.MPTK_SFFilterSetDefault ( )

[MPTK PRO] Set Filter SoundFont default value as defined in fluidsynth.

◆ MPTK_SFReverbSetDefault()

void MidiPlayerTK.MidiSynth.MPTK_SFReverbSetDefault ( )

[MPTK PRO] Set Reverb SoundFont default value as defined in fluidsynth.

Default chorus voice count

◆ MPTK_StartSequencerMidi()

void MidiPlayerTK.MidiSynth.MPTK_StartSequencerMidi ( )

Start the MIDI sequencer: each midi events are read and play in a dedicated thread.
This thread is automatically started by prefabs MidiFilePlayer, MidiListPlayer, MidiExternalPlayer.

◆ MPTK_StopSynth()

void MidiPlayerTK.MidiSynth.MPTK_StopSynth ( )

Stop processing samples by the synth and the MIDI sequencer.

◆ MPTK_WaitAllNotesOff()

IEnumerator MidiPlayerTK.MidiSynth.MPTK_WaitAllNotesOff ( int  _idSession = -1)

Wait until all notes are off.
That could take some seconds due to the samples release time.
Therefore, the method exit after a timeout of 3 seconds.
*** Use this method only as a coroutine ***

// Call this method with: StartCoroutine(NextPreviousWithWait(false));
// See TestMidiFilePlayerScripting.cs
public IEnumerator NextPreviousWithWait(bool next)
yield return midiFilePlayer.MPTK_WaitAllNotesOff(midiFilePlayer.IdSession);
if (next)
CurrentIndexPlaying = midiFilePlayer.MPTK_MidiIndex;
yield return 0;
_idSessionclear only for samples playing with this session, -1 for all

◆ OnAudioFrameStartHandler()

delegate void MidiPlayerTK.MidiSynth.OnAudioFrameStartHandler ( double  synthTime)

[MPTK PRO] Delegate for the event OnAudioFrameStartHandler. see OnAudioFrameStart


Member Data Documentation

◆ MPTK_ApplyModLfo

bool MidiPlayerTK.MidiSynth.MPTK_ApplyModLfo

Apply LFO effect defined in the SoundFont

◆ MPTK_ApplyRealTimeModulator

bool MidiPlayerTK.MidiSynth.MPTK_ApplyRealTimeModulator

Apply real time modulatoreffect defined in the SoundFont: pitch bend, control change, enveloppe modulation

◆ MPTK_ApplySFChorus

bool MidiPlayerTK.MidiSynth.MPTK_ApplySFChorus

[MPTK PRO] Apply chorus effect as defined in the SoundFont.
This effect is processed with the fluidsynth algo independently on each voices but with a small decrease of performace (10%).

◆ MPTK_ApplySFFilter

bool MidiPlayerTK.MidiSynth.MPTK_ApplySFFilter

[MPTK PRO] Apply frequency low-pass filter as defined in the SoundFont.
This effect is processed with the fluidsynth algo independently on each voices but with a small decrease of performace (40%).

◆ MPTK_ApplySFReverb

bool MidiPlayerTK.MidiSynth.MPTK_ApplySFReverb

[MPTK PRO] Apply reverberation effect as defined in the SoundFont.
This effect is processed with the fluidsynth algo independently on each voices but with a small decrease of performace (40%).

◆ MPTK_ApplyVibLfo

bool MidiPlayerTK.MidiSynth.MPTK_ApplyVibLfo

Apply vibrato effect defined in the SoundFont

◆ MPTK_AudioSettingFromUnity

bool MidiPlayerTK.MidiSynth.MPTK_AudioSettingFromUnity

If true then rate synth and buffer size will be automatically defined by Unity in accordance of the capacity of the hardware. - V2.89.0 -
Look at Unity menu "Edit / Project Settings..." and select between best latency and best performance.
If false, then rate and buffer size can be defined manually ... but with the risk of bad audio quality. It's more an experimental capacities!

◆ MPTK_AutoBuffer

bool MidiPlayerTK.MidiSynth.MPTK_AutoBuffer = true

Voice buffering is important to get better performance. But you can disable this fonction with this parameter.

◆ MPTK_AutoCleanVoiceLimit

int MidiPlayerTK.MidiSynth.MPTK_AutoCleanVoiceLimit

Free voices older than MPTK_AutoCleanVoiceLimit are removed when count is over than MPTK_AutoCleanVoiceTime

◆ MPTK_CorePlayer

bool MidiPlayerTK.MidiSynth.MPTK_CorePlayer

If true then MIDI events are read and play from a dedicated thread.
If false, MidiSynth will use AudioSource gameobjects to play sound.
This properties must be defined before running the application from the inspector.
The default is true.
Warning: The non core mode player (MPTK_CorePlayer=false) will be removed with the next major version (V3)

◆ MPTK_CutOffVolume

float MidiPlayerTK.MidiSynth.MPTK_CutOffVolume = 0.05f

When amplitude is below this value the playing of sample is stopped (voice_off).
Can be increase for better performance but with degraded quality because sample could be stopped earlier. Remember: Amplitude can varying between 0 and 1.

◆ MPTK_DirectSendToPlayer

bool MidiPlayerTK.MidiSynth.MPTK_DirectSendToPlayer

If true (default) then MIDI events are sent automatically to the midi player.
Set to false if you want to process events without playing sound.
OnEventNotesMidi Unity Event can be used to process each notes.

◆ MPTK_EnableChangeTempo

bool MidiPlayerTK.MidiSynth.MPTK_EnableChangeTempo

Should accept change tempo from MIDI Events ?

◆ MPTK_EnableFreeSynthRate

bool MidiPlayerTK.MidiSynth.MPTK_EnableFreeSynthRate = false

Allow direct setting of the Synth Rate

◆ MPTK_EnablePanChange

bool MidiPlayerTK.MidiSynth.MPTK_EnablePanChange

Should change pan from MIDI Events or from SoundFont ?
Pan is disabled when Spatialization is activated.

◆ MPTK_EnablePresetDrum

bool MidiPlayerTK.MidiSynth.MPTK_EnablePresetDrum

Should accept change Preset for Drum canal 10 ?
Disabled by default. Could sometimes create bad sound with midi files not really compliant with the MIDI norm.

◆ MPTK_KillByExclusiveClass

bool MidiPlayerTK.MidiSynth.MPTK_KillByExclusiveClass = true

V2.83 Find the exclusive class of this voice. If set, kill all voices that match the exclusive class
and are younger than the first voice process created by this noteon event.

◆ MPTK_LeanSynthStarting

float MidiPlayerTK.MidiSynth.MPTK_LeanSynthStarting = 0.05f

V2.873 - A lean startup of the volume of the synth is useful to avoid weird sound at the beginning of the application (in some cases).
This parameter sets the speed of the increase of the volume of the audio source.
Set to 1 for an immediate full volume at start.

◆ MPTK_LogWave

bool MidiPlayerTK.MidiSynth.MPTK_LogWave

Log for each wave to be played

◆ MPTK_ReleaseSameNote

bool MidiPlayerTK.MidiSynth.MPTK_ReleaseSameNote = true

V2.83. If the same note is hit twice on the same channel, then the older voice process is advanced to the release stage.
It's the default Midi processing.

◆ MPTK_ReleaseTimeMin

uint MidiPlayerTK.MidiSynth.MPTK_ReleaseTimeMin = 500000

[Only when CorePlayer=False] Define a minimum release time at noteoff in 100 iem nanoseconds.
Default 50 ms is a good tradeoff. Below some unpleasant sound could be heard. Useless when MPTK_CorePlayer is true.

◆ MPTK_ReleaseTimeMod

float MidiPlayerTK.MidiSynth.MPTK_ReleaseTimeMod = 1f

When a note is stopped with a noteoff or when the duration is over, note continue to play for a short time depending the instrument.

This parameter is a multiplier to increase or decrease the default release time defined in the SoundFont for each instrument.
Recommended values between 0.1 and 10. Default is 1 (no modification of the release time).
Performance issue: the longer it lasts the more CPU is used after the noteon. With a long release time, a lot of samples will be played simultaneously.

◆ MPTK_ResetChannel

bool MidiPlayerTK.MidiSynth.MPTK_ResetChannel = true

Reset channel information when MIDI start playing. V2.89.0

◆ MPTK_SFChorusAmplify

float MidiPlayerTK.MidiSynth.MPTK_SFChorusAmplify

[MPTK PRO] Chorus level is defined in the SoundFont in the range [0, 1].
This parameter is added to the the default SoundFont value.
Range must be [-1, 1]

◆ MPTK_SFFilterFreqOffset

float MidiPlayerTK.MidiSynth.MPTK_SFFilterFreqOffset = 0f

[MPTK PRO] Frequency cutoff is defined in the SoundFont for each notes.
This parameter increase or decrease the default SoundFont value. Range: -2000 to 3000

◆ MPTK_SFReverbAmplify

float MidiPlayerTK.MidiSynth.MPTK_SFReverbAmplify

[MPTK PRO] Reverberation level is defined in the SoundFont in the range [0, 1].
This parameter is added to the the default SoundFont value.
Range must be [-1, 1]

◆ MPTK_SpatialSynthEnabled

bool MidiPlayerTK.MidiSynth.MPTK_SpatialSynthEnabled

[MPTK PRO] In spatialization mode not all MidiSynths are enabled.

◆ MPTK_StatVoiceCountActive

int MidiPlayerTK.MidiSynth.MPTK_StatVoiceCountActive

Count of the active voices (playing) - Readonly

◆ MPTK_StatVoiceCountFree

int MidiPlayerTK.MidiSynth.MPTK_StatVoiceCountFree

Count of the free voices for reusing on need.
Voice older than AutoCleanVoiceTime are removed but only when count is over than AutoCleanVoiceLimit - Readonly

◆ MPTK_StatVoicePlayed

int MidiPlayerTK.MidiSynth.MPTK_StatVoicePlayed

Count of voice played since the start of the synth

◆ MPTK_StatVoiceRatioReused

float MidiPlayerTK.MidiSynth.MPTK_StatVoiceRatioReused

Percentage of voice reused during the synth life. 0: any reuse, 100:all voice reused (unattainable, of course!)

◆ MPTK_WeakDevice

bool MidiPlayerTK.MidiSynth.MPTK_WeakDevice

Should play on a weak device (cheaper smartphone) ? Apply only with AudioSource mode (MPTK_CorePlayer=False).
Playing MIDI files with WeakDevice activated could cause some bad interpretation of MIDI Event, consequently bad sound.

◆ OnEventSynthAwake

EventSynthClass MidiPlayerTK.MidiSynth.OnEventSynthAwake

Unity event fired at awake of the synthesizer. Name of the gameobject component is passed as a parameter.
Setting this callback function by script (AddListener) is not recommended. It's better to set callback function from the inspector.

Example of script (but it's recommended to set callback function from the inspector).

public void StartLoadingSynth(string name)
Debug.LogFormat("Synth {0} loading", name);

◆ OnEventSynthStarted

EventSynthClass MidiPlayerTK.MidiSynth.OnEventSynthStarted

Unity event fired at start of the synthesizer. Name of the gameobject component is passed as a parameter.
Setting this callback function by script (AddListener) is not recommended. It's better to set callback function from the inspector.

Example of script (it's recommended to set callback function from the inspector).

public void EndLoadingSynth(string name)
Debug.LogFormat($"Synth {name} loaded, now change bank and preset");
// It's recommended to defined callback method (here EndLoadingSynth) in the prefab MidiStreamPlayer from the Unity editor inspector.
// EndLoadingSynth will be called when the synthesizer will be ready.
// These calls will not work in Unity Awake() or Startup() because Midi synth must be ready when changing preset and/or bank.
// Mandatory for updating UI list but not for playing sample.
// The default instrument and drum banks are defined with the popup "SoundFont Setup Alt-F" in the Unity editor.
// This method can be used by script to change the instrument bank and build presets available for it: MPTK_ListPreset.
// Don't forget to initialize your MidiStreamPlayer variable, see link below:
// https://paxstellar.fr/api-mptk-v2/#DefinedVariablePrefab
// Channel 0: set Piano (if SoundFont is GeneralUser GS v1.471)
// Define bank with CurrentBank (value defined in inspector to 0).
midiStreamPlayer.MPTK_PlayEvent(new MPTKEvent() { Command = MPTKCommand.ControlChange, Controller = MPTKController.BankSelectMsb, Value = CurrentBank, Channel = StreamChannel, });
Debug.LogFormat($" Bank '{CurrentBank}' defined on channel {StreamChannel}");
// Defined preset with CurrentPreset (value defined in inspector to 0).
midiStreamPlayer.MPTK_ChannelPresetChange(StreamChannel, CurrentPreset);
Debug.LogFormat($" Preset '{midiStreamPlayer.MPTK_ChannelPresetGetName(0)}' defined on channel {StreamChannel}");
// Playing a preset from another bank in the channel 1
// Channel 1: set Laser Gun (if SoundFont is GeneralUser GS v1.471)
int channel = 1, bank = 2, preset = 127;
midiStreamPlayer.MPTK_PlayEvent(new MPTKEvent() { Command = MPTKCommand.ControlChange, Controller = MPTKController.BankSelectMsb, Value = bank, Channel = channel, });
midiStreamPlayer.MPTK_ChannelPresetChange(channel, preset);
// MPTK_GetPatchName mandatory for getting the patch nane when the bank is not the default bank.
Debug.LogFormat($" Preset '{MidiPlayerGlobal.MPTK_GetPatchName(bank, preset)}' defined on channel {channel} and bank {bank}");
Description of a MIDI Event. The heart of MPTK! Essential to handling MIDI by script from all others ...
Definition: MPTKEvent.cs:387
Singleton class to manage all globales MPTK features. More information here: https://paxstellar....
Definition: MidiPlayerGlobal.cs:18
static bool MPTK_SelectBankInstrument(int nbank)
Definition: MidiPlayerGlobal.cs:485
Definition: MPTKEvent.cs:127
Definition: MPTKEvent.cs:15

◆ OnMidiEvent

Action<MPTKEvent> MidiPlayerTK.MidiSynth.OnMidiEvent

[MPTK PRO] V2.89.0 - This function is called by the MIDI sequencer before sending the MIDI message to the MIDI synthesizer.
It can be used like a MIDI events preprocessor: it's possible to change the value of the MIDI events and therefore change the playback of the song.
The callback function receives a MPTKEvent object by reference (normal, it's a C# class).
Look at https://mptkapi.paxstellar.com/d9/d50/class_midi_player_t_k_1_1_m_p_t_k_event.html
A lot change is possible on the MIDI event: change note, velocity, channel, ..., even changing the MIDI type of the message!!!
See below some examples of changes.

  • Note 1: the callback is running on a system thread not on the Unity thread. Unity API call is not possible except for the Debug.Log (to be gently used, it consumes CPU)
  • Note 2: avoid heavy processing or waiting inside the callback otherwise MIDI playing accuracy will be bad.
  • Note 3: the midiEvent is passed by reference to the callback, so re-instanciate object (midiEvent = new MPTKEvent()) or set to null, has no effect!
  • Note 4: MIDI position attributs (Tick and RealTime) can be used in your algo but changing their values has no effect, it's too late!
  • Note 5: Changing SetTempo event is too late for the MIDI Sequencer (already taken into account). But you can use midiFilePlayer.MPTK_Tempo to change the tempo
    // See TestMidiFilePlayerScripting.cs for the demo.
    void Start()
    MidiFilePlayer midiFilePlayer = FindObjectOfType<MidiFilePlayer>();
    midiFilePlayer.OnMidiEvent = PreProcessMidi;
    // Some example
    void PreProcessMidi(MPTKEvent midiEvent)
    switch (midiEvent.Command)
    case MPTKCommand.NoteOn:
    if (midiEvent.Channel != 9)
    // transpose 2 octaves
    midiEvent.Value += 24;
    // Drums are muted
    midiEvent.Velocity = 0;
    case MPTKCommand.PatchChange:
    // Remove all patch change: all channels will played the default preset 0!!!
    midiEvent.Command = MPTKCommand.MetaEvent;
    midiEvent.Meta = MPTKMeta.TextEvent;
    midiEvent.Info = "Patch Change removed";
    case MPTKCommand.MetaEvent:
    if (midiEvent.Meta == MPTKMeta.SetTempo)
    // Tempo forced to 100
    midiFilePlayer.MPTK_Tempo = 100
    MPTKMeta Meta
    Definition: MPTKEvent.cs:438
    MPTKCommand Command
    Definition: MPTKEvent.cs:426
    int Channel
    Definition: MPTKEvent.cs:486
    Play a MIDI file from the MidiDB. This class must be used with the prefab MidiFilePlayer.
    Definition: MidiFilePlayer.cs:64
    Definition: MPTKEvent.cs:316

◆ playOnlyFirstWave

bool MidiPlayerTK.MidiSynth.playOnlyFirstWave

Preset are often composed with 2 or more samples, classically for left and right channel. Check this to play only the first sample found

◆ SpatialSynths

List<MidiFilePlayer> MidiPlayerTK.MidiSynth.SpatialSynths

Contains each Midi Synth for each channel or track when the prefab MidiSpatializer is used and IsMidiChannelSpace=true.
Warning: only one MidiSpatializer can be used in a hierarchy.

Property Documentation

◆ MPTK_ApplyUnityChorus

bool MidiPlayerTK.MidiSynth.MPTK_ApplyUnityChorus

[MPTK PRO] Apply Chorus Unity effect to the AudioSource. The effect is applied to all voices.

◆ MPTK_ApplyUnityReverb

bool MidiPlayerTK.MidiSynth.MPTK_ApplyUnityReverb

[MPTK PRO] Apply Reverb Unity effect to the AudioSource. The effect is applied to all voices.

◆ MPTK_ChorusDelay

float MidiPlayerTK.MidiSynth.MPTK_ChorusDelay

[MPTK PRO] Chorus delay in ms.
Range from 0.1 to 100. Default = 40 ms.

◆ MPTK_ChorusDepth

float MidiPlayerTK.MidiSynth.MPTK_ChorusDepth

[MPTK PRO] Chorus modulation depth.
Range from 0 to 1. Default = 0.03.

◆ MPTK_ChorusDryMix

float MidiPlayerTK.MidiSynth.MPTK_ChorusDryMix

[MPTK PRO] Volume of original signal to pass to output.
Range from 0 to 1. Default = 0.5.

◆ MPTK_ChorusRate

float MidiPlayerTK.MidiSynth.MPTK_ChorusRate

[MPTK PRO] Chorus modulation rate in hz.
Range from 0 to 20. Default = 0.8 hz.

◆ MPTK_ChorusWetMix1

float MidiPlayerTK.MidiSynth.MPTK_ChorusWetMix1

[MPTK PRO] Volume of 1st chorus tap.
Range from 0 to 1. Default = 0.5.

◆ MPTK_ChorusWetMix2

float MidiPlayerTK.MidiSynth.MPTK_ChorusWetMix2

[MPTK PRO] Volume of 2nd chorus tap. This tap is 90 degrees out of phase of the first tap.
Range from 0 to 1. Default = 0.5.

◆ MPTK_ChorusWetMix3

float MidiPlayerTK.MidiSynth.MPTK_ChorusWetMix3

[MPTK PRO] Volume of 3rd chorus tap. This tap is 90 degrees out of phase of the second tap.
Range from 0 to 1. Default = 0.5.

◆ MPTK_IndexSynthBuffSize

int MidiPlayerTK.MidiSynth.MPTK_IndexSynthBuffSize

Set or Get synth buffer size -1:default, 0:64, 1;128, 2:256, 3:512, 4:1024, 5:2048.
The change is global for all prefab. It's better to stop playing for all prefab before changing on fly to avoid bad noise or crash.

◆ MPTK_IndexSynthRate

int MidiPlayerTK.MidiSynth.MPTK_IndexSynthRate

Set or Get sample rate output of the synth. -1:default, 0:24000, 1:36000, 2:48000, 3:60000, 4:72000, 5:84000, 6:96000.
It's better to stop playing before changing on fly to avoid bad noise.

◆ MPTK_InstrumentPlayed

string MidiPlayerTK.MidiSynth.MPTK_InstrumentPlayed

[MPTK PRO] If spatialization is track mode, contains the last instrument played on this track

◆ MPTK_IsSpatialSynthMaster

bool MidiPlayerTK.MidiSynth.MPTK_IsSpatialSynthMaster

[MPTK PRO] True if this MidiSynth is the master synth responsible to read midi events and to dispatch to other MidiSynths

◆ MPTK_KeepPlayingNonLooped

bool MidiPlayerTK.MidiSynth.MPTK_KeepPlayingNonLooped

V2.83 When the value is true, NoteOff and Duration for non-looped samples are ignored and the samples play through to the end.

◆ MPTK_MaxDistance

float MidiPlayerTK.MidiSynth.MPTK_MaxDistance

If MPTK_Spatialize is enabled, the volume of the audio source depends on the distance between the audio source and the listener.
Beyong this distance, the volume is set to 0 and the midi player is paused. No effect if MPTK_Spatialize is disabled.

◆ MPTK_PauseOnDistance

bool MidiPlayerTK.MidiSynth.MPTK_PauseOnDistance

[obsolete] replaced by MPTK_Spatialize"); V2.83

◆ MPTK_ReverbDecayHFRatio

float MidiPlayerTK.MidiSynth.MPTK_ReverbDecayHFRatio

[MPTK PRO] Decay HF Ratio : High-frequency to low-frequency decay time ratio.
Ranges from 0.1 to 2.0.

◆ MPTK_ReverbDecayTime

float MidiPlayerTK.MidiSynth.MPTK_ReverbDecayTime

[MPTK PRO] Reverberation decay time at low-frequencies in seconds.
Ranges from 0.1 to 20. Default is 1.

◆ MPTK_ReverbDelay

float MidiPlayerTK.MidiSynth.MPTK_ReverbDelay

[MPTK PRO] Late reverberation delay time relative to first reflection in seconds.
Ranges from 0 to 0.1. Default is 0.04

◆ MPTK_ReverbDensity

float MidiPlayerTK.MidiSynth.MPTK_ReverbDensity

[MPTK PRO] Reverberation density (modal density) in percent.
Ranges from 0 to 1.

◆ MPTK_ReverbDiffusion

float MidiPlayerTK.MidiSynth.MPTK_ReverbDiffusion

[MPTK PRO] Reverberation diffusion (echo density) in percent.
Ranges from 0 to 1. Default is 1.

◆ MPTK_ReverbDryLevel

float MidiPlayerTK.MidiSynth.MPTK_ReverbDryLevel

[MPTK PRO] Mix level of dry signal in output.
Ranges from 0 to 1.

◆ MPTK_ReverbHFReference

float MidiPlayerTK.MidiSynth.MPTK_ReverbHFReference

[MPTK PRO] Reference high frequency in Hz.
Ranges from 1000 to 20000. Default is 5000

◆ MPTK_ReverbLevel

float MidiPlayerTK.MidiSynth.MPTK_ReverbLevel

[MPTK PRO] Late reverberation level relative to room effect.
Ranges from 0 to 1.

◆ MPTK_ReverbLFReference

float MidiPlayerTK.MidiSynth.MPTK_ReverbLFReference

[MPTK PRO] Reference low-frequency in Hz.
Ranges from 20 to 1000. Default is 250

◆ MPTK_ReverbReflectionDelay

float MidiPlayerTK.MidiSynth.MPTK_ReverbReflectionDelay

[MPTK PRO] Late reverberation level relative to room effect.
Ranges from -10000.0 to 2000.0. Default is 0.0.

◆ MPTK_ReverbReflectionLevel

float MidiPlayerTK.MidiSynth.MPTK_ReverbReflectionLevel

[MPTK PRO] Early reflections level relative to room effect.
Ranges from 0 to 1.

◆ MPTK_ReverbRoom

float MidiPlayerTK.MidiSynth.MPTK_ReverbRoom

[MPTK PRO] Room effect level at low frequencies.
Ranges from 0 to 1.

◆ MPTK_ReverbRoomHF

float MidiPlayerTK.MidiSynth.MPTK_ReverbRoomHF

[MPTK PRO] Room effect high-frequency level.
Ranges from 0 to 1.

◆ MPTK_ReverbRoomLF

float MidiPlayerTK.MidiSynth.MPTK_ReverbRoomLF

[MPTK PRO] Room effect low-frequency level.
Ranges from 0 to 1.

◆ MPTK_SFChorusDepth

float MidiPlayerTK.MidiSynth.MPTK_SFChorusDepth

[MPTK PRO] Set the SoundFont chorus effect depth
Chorus depth [0, 256]

◆ MPTK_SFChorusLevel

float MidiPlayerTK.MidiSynth.MPTK_SFChorusLevel

[MPTK PRO] Set the SoundFont chorus effect level [0, 10]
V2.88.2 - becomes a parameter and default value set to 0.9 (was 2f, thank John)

◆ MPTK_SFChorusSpeed

float MidiPlayerTK.MidiSynth.MPTK_SFChorusSpeed

[MPTK PRO] Set the SoundFont chorus effect speed
Chorus speed in Hz [0.1, 5]

◆ MPTK_SFChorusWidth

float MidiPlayerTK.MidiSynth.MPTK_SFChorusWidth

[MPTK PRO] Set the SoundFont chorus effect width
The chorus unit process a monophonic input signal and produces stereo output controlled by WIDTH macro.
Width allows to get a gradually stereo effect from minimum (monophonic) to maximum stereo effect. [0, 10]

◆ MPTK_SFFilterQModOffset

float MidiPlayerTK.MidiSynth.MPTK_SFFilterQModOffset

[MPTK PRO] Quality Factor is defined in the SoundFont for each notes.
This parameter increase or decrease the default SoundFont value. Range: -96 to 96.

◆ MPTK_SFReverbDamp

float MidiPlayerTK.MidiSynth.MPTK_SFReverbDamp

[MPTK PRO] Set the SoundFont reverb effect damp [0,1].
Controls the reverb time frequency dependency. This controls the reverb time for the frequency sample rate/2
When 0, the reverb time for high frequencies is the same as for DC frequency.
When > 0, high frequencies have less reverb time than lower frequencies.

◆ MPTK_SFReverbLevel

float MidiPlayerTK.MidiSynth.MPTK_SFReverbLevel

[MPTK PRO] Set the SoundFont reverb effect level

◆ MPTK_SFReverbRoomSize

float MidiPlayerTK.MidiSynth.MPTK_SFReverbRoomSize

[MPTK PRO] Set the SoundFont reverb effect room size. Controls concave reverb time between 0 (0.7 s) and 1 (12.5 s)

◆ MPTK_SFReverbWidth

float MidiPlayerTK.MidiSynth.MPTK_SFReverbWidth

[MPTK PRO] Set the SoundFont reverb effect width [0,100].
Controls the left/right output separation.
When 0, there are no separation and the signal on left and right output is the same.This sounds like a monophonic signal.
When 100, the separation between left and right is maximum.

◆ MPTK_Spatialize

bool MidiPlayerTK.MidiSynth.MPTK_Spatialize

Should the Spatialization effect must be enabled?
See here how to setup spatialization with Unity https://paxstellar.fr/midi-file-player-detailed-view-2/#Foldout-Spatialization-Parameters if MPTK_Spatialize is true:
AudioSource.maxDistance = MPTK_MaxDistance
AudioSource.spatialBlend = 1
AudioSource.spatialize = true
AudioSource.spatializePostEffects = true

◆ MPTK_SpatialSynthIndex

int MidiPlayerTK.MidiSynth.MPTK_SpatialSynthIndex

Index of the MidiSynth for the dedicated Channel or Track when the prefab MidiSpatializer is used.
If MPTK_ModeSpatializer = Channel then represent the playing channel.
If MPTK_ModeSpatializer = Track then represent the playing track.
The value is -1 for the Midi reader because no voice is played.

◆ MPTK_SynthRate

int MidiPlayerTK.MidiSynth.MPTK_SynthRate

Get the the current synth rate or set free value (only if MPTK_EnableFreeSynthRate is true).

◆ MPTK_TrackName

string MidiPlayerTK.MidiSynth.MPTK_TrackName

[MPTK PRO] If spatialization is track mode, contains the last name of the track

◆ MPTK_TransExcludedChannel

int MidiPlayerTK.MidiSynth.MPTK_TransExcludedChannel

Transpose will apply to all channels except this one. Set to -1 to apply to all channel. V2.89.0
Default is 9 because generally we don't want to transpose drum channel.

◆ MPTK_Transpose

int MidiPlayerTK.MidiSynth.MPTK_Transpose

Transpose note from -24 to 24

◆ MPTK_Volume

float MidiPlayerTK.MidiSynth.MPTK_Volume

Global Volume. apply to all channels.
Must be >=0 and <= 1

Event Documentation

◆ OnAudioFrameStart

OnAudioFrameStartHandler MidiPlayerTK.MidiSynth.OnAudioFrameStart

[MPTK PRO] this event is triggered at each start of a new audio frame from the audio engine.
The parameter (double) is the current synth time in milliseconds. See example of use.
The callbach function will not run on the Unity thread, so you can't call Unity API except Debug.Log.

// See Assets\MidiPlayer\Demo\ProDemos\Script\EuclideSeq\TestEuclideanRhythme.cs for the full code.
public void Play()
if (IsPlaying)
midiStream.OnAudioFrameStart += PlayHits;
midiStream.OnAudioFrameStart -= PlayHits;
private void PlayHits(double synthTimeMS)
if (lastSynthTime <= 0d)
// First call, init the last time
lastSynthTime = synthTimeMS;
// Calculate time in millisecond since the last loop
double deltaTime = synthTimeMS - lastSynthTime;
lastSynthTime = synthTimeMS;
timeMidiFromStartPlay += deltaTime;
// Calculate time since last beat played
timeSinceLastBeat += deltaTime;
// Slider SldTempo in BPM.
// 60 BPM means 60 beats in each minute, 1 beat per second, 1000 ms between beat.
// 120 BPM would be twice as fast: 120 beats in each minute, 2 per second, 500 ms between beat.
// Calculate the delay between two quarter notes in millisecond
CurrentTempo = (60d / SldTempo.Value) * 1000d;
// Is it time to play a hit ?
if (IsPlaying && timeSinceLastBeat > CurrentTempo)
timeSinceLastBeat = 0d;