Using a simple stage setting say piano & strings pan the piano to the left & the strings to the right. Connect the left line out directly to the amp & the right line out to the volume pedal & then to the amp. The downside to this is that you have to zero reverb & digital delay only to the side that you are connecting to the volume pedal. If you don't do this you get a leakage of sound to the other channel. You don't have to zero the other side reverb & digital delay because the amount leakage you get doesn't matter (or doesn't matter to me anyway). If someone reads this a can figure out some way that you don't have to zero reverb & digital delay that would be good. It's a bit sad that you have to do this to such a really good keyboard but I suppose that you just have to live with it. like having a wart on your nose.