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I have an Express XT and a Micro Express both hooked up to a Mac G4. My question is: what's the easiest way to control a device hooked up to one interface via a controller hooked up to the other? I mean, BESIDES connecting them together with a MIDI cable. I'd like to do it via USB thru the Mac.

I use a BCF and a axiom every with usb and no problem.
In your seq you can choose the right in.
I use in multirecord for control different virtual instrument with two keyboards, work fine.