I am using kAudioUnitSubType_MIDISynth Audio Unit in my iOS app.
I successfully loaded Fluid R3 GM soundfont into it and I figured out how
to select a preset for a specific channel.
I am able to use all presets of the soundfont from the bank 0. But the
percussion presets, which I also what to use, are in the bank 128 (as I see
in the Polyphone app).
I could not find any documentation on how to do it. I tried to send bank
select messages to the unit, but had no success with it.
Here is the method I currently use to set the preset and the bank:
-(*void*) setPreset:(UInt32) preset bank:(UInt32) bank forChannel:(UInt8)
channel forInstrumentUnit:(AudioUnit) instrumentUnit {
// set the instrumentUnit into mode when it loads the requested preset
into memory
UInt32 preloadEnabled = 1;
OSStatus err = AudioUnitSetProperty(
instrumentUnit,
kAUMIDISynthProperty_EnablePreload,
kAudioUnitScope_Global,
0,
&preloadEnabled,
*sizeof*(preloadEnabled));
*if* (err) {
NSLog(@"Unable to set enablePreload property: %@", @(err));
}
// Send bank load message MSB
UInt32 ccCommand = 0xB0 | channel;
UInt32 bankMsb = bank >> 7;
err = MusicDeviceMIDIEvent(instrumentUnit, ccCommand, 0, bankMsb, 0);
*if* (err) {
NSLog(@"Failed to load preset: %@ in %s.", @(err), *__PRETTY_FUNCTION__*);
}
UInt32 bankLsb = bank & 0x7F;
err = MusicDeviceMIDIEvent(instrumentUnit, ccCommand, 0x20, bankLsb, 0);
*if* (err) {
NSLog(@"Failed to load preset: %@ in %s.", @(err), *__PRETTY_FUNCTION__*);
}
// request preset on the channel to load it into memory(but it is not
activated here)
UInt32 pcCommand = 0xC0 | channel;
err = MusicDeviceMIDIEvent(instrumentUnit, pcCommand, preset, 0, 0);
*if* (err) {
NSLog(@"Failed to load preset: %@ in %s.", @(err), *__PRETTY_FUNCTION__*);
}
// set instrumentUnit into regular mode when the requested preset is
activetad for the specified channel
preloadEnabled = 0; //disable preload property
err = AudioUnitSetProperty(
instrumentUnit,
kAUMIDISynthProperty_EnablePreload,
kAudioUnitScope_Global,
0,
&preloadEnabled,
*sizeof*(preloadEnabled));
*if* (err) {
NSLog(@"Unable to set enablePreload property: %@", @(err));
}
// repeat programm change command to actually activate the presed for
the channel after it has been loaded in the previous steps
err = MusicDeviceMIDIEvent(instrumentUnit, pcCommand, preset, 0, 0);
*if* (err) {
NSLog(@"Failed to activate preset: %@ in %s.", @(err),
*__PRETTY_FUNCTION__*);
}
}
Could you please tell if the MIDISynth unit supports soundfonts with
multiple banks, and what is the correct way to set a bank for a specific
channel?
Best regards,
Dmitry
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