Though I found using a single R (or was that the L/R) channel better than the sum of the two, neither is really acceptable sounding to me. The only REAL solution (for me) was to go out stereo. Thank God for the recent release of the 'all in one unit' Motion Sound KP stereo keyboard amps: KP200S & KP100S. I use & highly recommend them: http://motion-sound.com/keypro_amplifiers.htm

Scott