Is there any dis/advantage to plugging in the left and right 'outs' of a keyboard into a mono amp. Specifically, does it help or hurt the sound if I put my E-60 into my Mackie 808s PA, either in two separate channels or into channel 8, where there are R/L inputs? I use the Mackie as a mains & monitor amp, not as a stereo mains.

BTW, I think I like my e60 even better than the g70. I only wish it had the harmonizer section. Getting around the keyboard is a lot easier. There are less onboard styles, but they are on the money, very little trash.