Feature Request: stop activates midi_all_notes_off if midi subsystem is enabled

[saturnation]

When stopping a buffer if stopped before a note off is set then the note will continue to be played until midi_all_notes_off is executed.

[samaaron]

It's a nice idea. However, the problem is to know which MIDI devices to send midi_all_notes_off to. I'm assuming it's not always appropriate to send it to all connected devices. Which means you'll need some way of selecting which ones to send to.

All this starts to make the interface more complex to realise. Happy to discuss ideas to overcome all this though :-)