Hi Ponty
Depending on where you loaded it from, the SD, or floppy, you should have full control using the SD volume button or APC/Sequencer slider. With the main volume up and either of the others down, you should be able to balance it fine, unless you are playing direct from your computer. Then use Line in Volume.

Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact