Class MPTKEvent - Generate MIDI Events as NoteOn and apply Real Time Effect

MPTKEvent class is a central class for all these activities:

Real time Processing of Midi events from MidiFilePlayer.
Build music from scratch with MidiStreamPlayer.
Read midi events from a Midi file with MidiLoad.
Receive midi events from keyboard with MidiInReader or MidiKeyboard.

With this MPTKEvent, you can:

Play and stop a note.
Modify in real time default internal synthesizer generators values.
Change instrument (preset, patch, …).
Change controllers values.
Change default value of the SoundFont generator.
Access to the parameters of each voice.

Attributes

Methods

MTPK_ModifySynthParameter(
   fluid_gen_type genType, 
   float value, 
   MPTKModeGeneratorChange mode)

Apply modification on default SoundFont generator value. Can be applied independently for each notes, can be applied in real time when the note is played.

genType Type of generator to modify. Not all generators are authorized to real time modification.
value for the generator between 0 (min value for the generator) and 1 (max value for the generator)
mode
- Override: the SoundFont value is overridden,
- Reinforce: the value is added to the default value.

See here to get a sheet

This sheet contains with detailed explanations of parameters as volume envelope (ADSR) and tuning.

// Create a midi event for a C5 note (60) 
mptkEvent = new MPTKEvent() { Value = 60 };
// Fine tuning (pitch)
mptkEvent.MPTK_ModifySynthGenerator(fluid_gen_type.GEN_FINETUNE, 0.52f, 
                                    MPTKModeGeneratorChange.Override);
// Change low pass filter frequency
mptkEvent.MPTK_ModifySynthGenerator(fluid_gen_type.GEN_FILTERFC, 0.6f, 
                                    MPTKModeGeneratorChange.Override);
midiStream.MPTK_PlayDirectEvent(mptkEvent);

Generator List

The range of the internal values of the SoundFont synthesizer depends on the type of generator. In the hope that will help using this method, the value in MTPK_ModifySynthParameter is normalize : with 0 the minimum value of the parameter is used, with 1 the maximum.

For example, the range of value for “Modulation LFO To Pitch” is -12000 to 12000. Also, a value of 0 in MTPK_ModifySynthParameter will set a value of -12000 for this generator and a value of 1 will set a value of 12000. Look here for the bravest 🙂