im not sure about pd, but i just figured out how to do it in max so its probably similar. the [noteout] in max doesnt send "proper" note off messages, it just sends 0 velocity that is interpreted as note off. but the midiplus controller needs an actual note off message, which it can get from the object [xnoteout]. look at the help file and fiddle around with it. again, has to be in clip mode. programs like ableton that this thing is designed for send the proper note off message.