For any of you who have a Tonemaster Twin Reverb, could you try this for me - plug a microphone into the Normal channel and see if it produces a full loud sound? I know that you'll need to use an adapter to enable it to plug into that 1/4 inch Normal channel input. (I'm in an all instrumental surf band, and we go old school with a mike plugged into one channel for talking to the crowd) If you could do this, thanks a lot.