Transforming Midi Controller

[schamass]

Maybe you should have a look to this thread… i am no accordion expert, but this could address your issue.

Too much Expression

I know this, but I think it is a bit different for a MIDI accordion bellows, as there is probably always a small breath which is probably continuously measured by some sensors and converted as a CC#11 message. The MIDI accordion should have an option to reduce the CC#11 rate, but it seems it is not the case.