Hi,
For those wanting to experiment with iPlug2-clap, I made a little temporary workaround for a bug that prevents controls from being updated whenever a preset is chosen.
The signal processing works correctly, it’s just that the controls don’t move when they should.
This is on Windows 10; I don’t know about Mac, I don’t have one.
I have tested this with Reaper, latest CLAP-enabled development branch.
I do not have Bitwig, so I can’t test there.
The workaround is simple:
E.g., in IPlugEffect.h, you would add:
#ifdef CLAP_API
// Filthy workaround to get the knobs to move on a preset change
void OnParamChangeUI(int paramIdx, EParamSource source = kUnknown) override;
#endif
Then in IPlugEffect.cpp, you add:
#ifdef CLAP_API
// Filthy workaround to get the knobs to move on a preset change
void IPlugEffect::OnParamChangeUI(int paramIdx, EParamSource source) {
if (source == EParamSource::kPresetRecall) {
SendParameterValueFromAPI(paramIdx, GetParam(paramIdx)->Value(), false);
}
}
#endif
This makes the knobs move!
Please note that iPlug2-clap isn’t really production ready just yet, so just use this for testing, playing around, etc.
Also, once the bug gets fixed, I cannot predict what this workaround will do, so make sure to remove it once that happens.
Have fun! 
