Originally posted by big741.1:
I do regularly practice with two 12 inch wedges two feet from each ear with no problems. They're kinda like headphones. 
Thanks again,
Dan Monitor placement is vital in getting the most out of the Yamaha harmonizer...keeping any extraneous sounds out of the microphone is very important.
I use headphones when I record vocals with my S900 and Tyros3...works very well.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.