I'm not sure how the mono output of the E60 is configured. However, with the PSR and T1 series of keyboard, Yamaha's mono output is not a true combined, or summed mono. Instead, it's a psuedo mono that seems to loose some of the information from the unused channel. All it takes is one glance at the wiring diagram and you can see how the keyboard's output is routed when using mono V/S stero. When fired through two separate inputs, the difference in Yamaha's sound quality is substantial.

Good luck with the E60--it's a good keyboard.

Gary

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Travlin' Easy