[Alan Anderson]

Triple-check your wiring. Make sure the only thing connected to each Victor output is a single motor. Make sure the Victor power inputs are wired to a circuit breaker and the battery return with the proper polarity. Violating either of these can easily let the magic smoke (and noise!) out of a Victor.

And then make sure you didn't drop any metal chips inside the Victors while drilling or filing or otherwise cutting metal on the robot. That's generally accepted to be the number one cause of Victor failure.