Hypothetically, you could save one cable if you would input the right side of an instrument to one CM-30 and the left side to another. This would also give you two tone controls.

BUT WHY?

Setting up a CM-30 should be easy. If it gets that complicated, maybe you should consider something else. Don't forget, the "stereo link" is also a "mono" link for mono sources like mics - it's no different than a line out to connect two amps. And again, the stereo effect is really best for keyboard sounds that are meant to be heard in stereo.

This is my first experience with using stereo onstage; I'm only using it because it's available; and it sounds good.