Normally CSoundFile::CheckNNA is expected to end up in the forceCut path for samples and OPL instruments when being called from CSoundFile::RetrigNote. However that is not the case when a MIDI channel is assigned to the current instrument, even if there is no instrument plugin assigned.

Need to figure out what's the best way forward. Also check if there is a plugin assigned (but what if that's just an effect plugin)? Stop plugin notes in the forceCut path? That seems the most sensible and most consistent. This would in fact allow us to have an MPTM-only option to apply NNAs to retriggered notes in the future (though the way this is currently handled is a bit crude, I think, so it might require a bit more work).