Today we can control two parameters via MIDI CC that must be setup in advance. The assignment for expression 1 and expression 2 configure which parameter MIDI CC (and expression) can set a value for either of those. The AA needs a command to change which parameter is controlled by MIDI CC (for expression pedals 1 and 2). Details: Ideally this change also holds the last value set for the old parameter unless otherwise changed. This is probably two commands to handle all 140+ assignable params (since CC params are limited to 128 values). OK to limit the rate at which this can be called (e.g., ignore multiple requests received faster than 100ms). This really unlocks a lot of value for the AA allowing many deep params to be changed on the fly (more than you could have presets) or varied continuously from a variety of other devices that simply need to send a midi message.