Add pedal block for midi switching real amp channels

When using a real amp in conjunction with the quad cortex, having a channel switching block on stomp mode to be able to change amp channels would be a great feature. Off is one midi message to the amp, on is another midi message.

Hi @Logannikolic, there are already a lot of requests for more MIDI functions, though most are focused on Scenes rather than Stomp mode. Some have a high number of votes, so I suggest checking them out: