Bill,
See page 186 of the Tyros 2 manual. You can assign the Mic to Sub outputs which are not controlled by the volume pedal. Run the sub outputs to whatever post-processing/amplification you need.
Al
P.S. Fran your constant T2/Yamaha bashing is really getting old. If you can't help someone, just say so. No one bashes your old outdated equipment. Please give it a rest.
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Al
Pa4x - LD Systems Maui 28 - Mackie Thumps