Louis,

If you're performing using any of the newer Yamaha boards, stereo is the only way to go. To most of us, there is no comparison between mono and stereo. The stereo sounds are clean, full and fill the room with incredible sound. While the mono sounds OK, the difference is significant.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)