I always use a MIDI controller to drive 2 machines from a single control surface and recently I switched from using straight mutes to volume control

this is much useful in the OT since mutes are at audio level (not at the sequencer level as in the other elektron machines) and sadly the fx are pre-volume, so delay and reverb tails are cut when you mute

having both volumen faders and mute buttons works great since you can use one or another…the faders are very organic to make quick or slow changes,
and since you got 2 levels for each track you can set your maximun with one and just open the fader to the max to achieve different levels…no controller callibration required