Probably not – your devices probably have different controller channels, but Vsig uses Sysex, so as long as the Sysex ID is set right (usually to 1), and it can see its way to the 7600 via whatever is in between (not a certainty, but beyond our control) it should be fine.

If you are in doubt, first connect the Vsig computer directly to the 7600. This should work. Then build up the chain one piece at a time, until it stops working.