Gar, yep, I utilize a modified version of your tweaked sound when I have to go out to a mono speaker, and agree that it offers some degree of improvement (thanks ) , but it still lacks the full body richness the stereo 'Grand Piano' voice going out to two discrete speakers delivers. For situations where live piano comping plays only a background role, it's fine, but for any 'exposed piano playing' of any kind (piano soloing, etc), going out to a single Bose L1 or any other mono speaker system just won't cut it with Yamaha keyboard stereo sampled pianos. My personal opinion only of course. - Scott