@musikbear, I'd always like to help. However I haven't looked at LMMS source deeply, and I'd be only able to do small patches to the code. And currently there's no open issues. Also, sometimes a new issue is a new kind of old issue, so if there would be new, I first look at the old for the informati...
https://stackoverflow.com/questions/386 ... m-function
That's what I mean by "convolve". For more, look in the code.
In common speech it means subtract the previous note if there's one, else subtract the note itself, which gets 0.