I have a yamaha ypg-625 and am struggling to get it to sound right with the band I'm in. It only has a single phone/out jack on the back, and I realize it's not truly meant to be a stage piano.

I"m plugging 1/4" cable from the phone/out jack into my Roland KC-150 (60 Watt) keyboard amp. When I do this though, and crank the amp up to top levels to compete with the guitarist and bassist's 100 watt amps, the sounds on my keyboard are tinny sounding and distorted.

Only thing I can think of is running a line out of my amp to our PA system and just using my Roland amp as a monitor for me on stage.

My question is I"m assuming my phone/out jack is stereo, but I believe the Roland amp is just mono inputs. Do I need a stereo-to-mono type of cable? What's the best way to set up my YPG-625 so I get a rich sounding piano in live shows... DI box in the mix somehow? Any adivce would be helpful. THANKS