I think you are right Don.
Atleast this is how it works on my Pro.
If I select a Mouse type it automatically turns off my voice and you can here only the mouse part.
Maybe a call to Yamaha help line might clear up things...

Good luck

Eric
_________________________
Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer