The quickest and easiest way is using Power Tracks and your PC. However, this can also be done on the keyboard as well using the onboard Song Creator software and the mixing console. Just load the song, then press Digital Recording/Song Creator, then tab to Channel and press the Mixing Console button repeatedly until you see the first 8 midi channels displayed at the bottom of the screen. This reveals the volume sliders, panpots and individual instruments. Each row can be accessed by pressing the button to the right or left of the row. Volume changes and panpot chantes are made using the individual number buttons at the bottom of the display. If you wish to change an instrument, say the type of lead, which if frequently on midi channel 4, press the "H" button (voice) then press the top of the #4 button and page of instruments containing that voice will open.
After making any volume or voice changes, exit to the channel page, press Execute, then press save and give the file a new name so you do not overwrite the orriginal.
That's all there is to it,
Gary
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Travlin' Easy