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Subject: Grounding Issue?

From: "tron400" <tron400@yahoo.com>
Date: 2012-02-24

#500 has had an intermittant hum for a while now. I thought that maybe it was related to the volume pedal jack, but I noticed yesterday that the volume of the hum changes when I move the track selector. Track C doesn't seem to have any hum, but Tracks A and B do. Any idea what the cause might be?

Bernie