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it maybe interference picked up through an unsheided or poorly sheided cable or through single coil type pickups rather though the amp itself. You might also try get your power for the amps and this unit through different circuits.
Are you using the original PA-4 power adapter that goes with this unit? Using the wrong one would cause it to not work properly. Weak batteries would do the same. A generic power adapter would also, if working would cause static noises in the sound. The PA-4 is an odd unit, it is 10volt DC at 1 amp output. IF the one you are using is less than 1 amp, meaning if it says 400mA or something with an "m" in front of the A, UNLESS it is at least 1000, then it isn't strong enough to work correctly, EVEN if it powers up. If you have the wrong one, you can find it here:
may be one of the electrolytic capacitors in the power supply has become leaky...this is a common problem among amplifiers...so you let it cool down..then after a period of time the capacitor heats up and then causes the hum...the power supply caps filter out the 60 hertz ac line noise...which is probably the frequency of the sound it is making...this is a good indication of these caps going bad....another thing you can check is to see if the amp is properly grounded(eg: the ground pin on the plug is present) and that you dont have an open cord or input
It sounds like you have cable in the wrong ports. Make sure your cabling goes in to out on all ports. Also make sure no cable are bent or heavy equipment on top of it. If your getting sound but sounds like muted sound its either cable in the wrong place bad cable or amp setting is to low.