Play layered multiple voices from one midi channel

I used a trick in my previous setup made with python and mido library.

I copied every incoming note message from channel one to channel 2 ( or 3,4...) and sent them all.


Something like this

for msg in keyboard:
     if msg.channel == 0:
         for channel in [1,2,3]:
             output.send(msg.copy(channel=channel))