rncbc.org a.k.a. Rui Nuno Capela

I thought I need that so external synths would get the volume change event?

I'll try without.

On the other hand, this implementation with midi channels has a drawback; you can't control audio tracks. However, I'm not aware of any standard that would be track based instead of channel based. And documentation on the topic seem to be scarce. I looked at your implementation for US-224, is that following any standard or is it just a tweak to make work? If it's a standard, perhaps it could be used also to control pan?

ad PS: Great news :)