Fran, (you're right) I did find reference to this in the EXR-7's manual on page 103. I wonder if other users overlooked this section. I didn't see anywhere that stated you can also adjust the (pan) of your songs tracks as well.
Strange that others who own the EXR series and even the GW-7 have complained about the inability to peform this task. It's odd...
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.