Question about [Voice] Missing promise during fillWithData

[acli]

While trying to add support for ALSA MIDI in to the standalone JACK client (so that I can use sfizz with rosegarden), I ran into a strange problem.

Sometimes (intermittent — sometimes it happens right away, sometimes it happens at a random time), when the modified sfizz_jack client is connected to my MIDI controller through ALSA (not through JACK), it will crash with an error that reads:

[Voice] Missing promise during fillWithData
Assert failed: ampegOut.data()
Assert failed at /TEMP_TESTING/clara/sfizz/src/sfizz/Voice.cpp:902
Trace/breakpoint trap

I tracked it to line 402 of ModMatrix.cpp, where if ((targetFlags & kModIsPerVoice) && regionId != target.key.region()) returns nullptr (possibly caused by the “[Voice] Missing promise during fillWithData” condition). My question is: What might be causing this to happen?

(If anyone wants to look at my code and see if I’ve done anything wrong, it’s at the patch_20240528a_ALSA_MIDI branch of my copy of the sfizz repository.)

Thanks very much in advance!

[acli]

Never mind. I think I didn’t copy enough of the process function.