In reply to:

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Well, I haven't had much time to really diagnose the problem, but today as I was carrying the empeg back into my house, I noticed that the connector on the back (the one that connects to the one in the sled at the back) is kinda loose. it doesn't move a lot or anything, but it wiggles slightly. The 2 screws are tightened as I tried to tighten them more with no avail. I was wondering if this wiggling is normal and if this could possibly cause the varying humming noises??

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That's normal.. That's so it can move slightly to correctly match up with the one in the harness, and dosn't bind..
I'm sure there's a FAQ entry, which someone else can point ya to.

Me.