Are you using a USB or FireWire audio interface to record your demos? You could use a stereo DI box from your keyboard or mixer with the ground lifted.
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~Johnathan
"The Shueys"
www.shueymusic.com
Yamaha Genos - RCF M20x - RCF HD10A (Stereo) - Jupiter Pocket Trumpet - Sennheiser e935 - Neumann KMS-104 plus-N