Hi Mike, if you use MG2 as a plugin in Cubase, which I think is the best way if you want to use it along with an external controller, you just have to get a midi expression pedal or a footstep midi controller and you will be able to do much more than just controling sustain.
I personnaly use a FCB1010 footcontroller which incorporate 2 expression pedals to which you can assign any effect you want with Cubase .
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