Sending program changes to VST3 doesn't work (FIXED)

[EvilDragon]

As easy as the thread title says.

You can try with OB-Xd nightly version, which added support for program changes: https://www.discodsp.net/obxd-nightly/

VST2 works just fine. VST3 doesn't. It should.

[mschnell]

Is receiving Program change a feature added late to the VST3 spec ? (Regarding the weird history of midi CC with VST3...)

-Michael

[schwa]

Sending program change messages fails for that plugin because it returns kNotImplemented from IUnitInfo::getUnitByBus, which is meant to tell us that the plugin can accept program change messages on a given MIDI bus/channel. If we skip that call and just assume the plugin can accept messages on any MIDI channel, it does process the program change messages.

[EvilDragon]

Originally Posted by mschnell

Is receiving Program change a feature added late to the VST3 spec ? (Regarding the weird history of midi CC with VSC 3...)

-Michael

It's been there for a few years at the very least, but indeed it's not implemented as it used to be in VST2. Also, OB-Xd is JUCE-based, so unsure how JUCE handles this...

@schwa - thanks for the info! So, this should be fixed on plugin side, then - or an option on Reaper's side?


(EDIT: OB-Xd developer responded by saying fix is underway based on info you provided, so I guess "plugin side" is the answer.)

[schwa]

Originally Posted by EvilDragon

this should be fixed on plugin side, then - or an option on Reaper's side?

As with many VST things it's not clear. What probably should happen is they should add support for that call for maximum compatibility, and we should pass the program change message along even without support for that call.

[EvilDragon]

Noted.

Could you enable passing that program change message anyways in the next dev build? I'd like to test if some other VST3s magically start working in that case. Thanks!


Protip: never EVER give Steinberg freedom to create an API or such a thing as a plugin format. They will most likely screw it up in unimaginable ways (Sadly nothing we can do about it )