Several months ago, the question of whether or not the mic input was mono or stereo (balanced) came up. At that time, I posted the wiring diagram for the psr-2000/2100, which clearly shows that the input was not balanced, though Yamaha used a stereo input jack. In fact, all of their 1/4-inch jacks were wired in mono, and several Tyros owners did test their board and discovered the mic input was mono as well. If I recall, Steve Demming also responded on that post and said the input was mono. Therefore, using a mic splitter or "Y" and a TSR adapter just doesn't make sense. I wish I were able to come to your Saturday night job, analyze the problem and come up with a viable solution. Short of this, I guess the only thing is to try all of the suggestions posted on the forums and hope one of them works.

Good Luck,

Gary