Currently Being ModeratedJan 5, 2013 12:15 PM (in response to joe44850)Re: Shouldn't the JTV-69 work on any amp?
When you have used the guitar with teh HD500 were you using the VDI connection to power the JTV? If so, and assuming the models workled OK in that setup, then there is nothing wrong with the modeling in the guitar.
I suspect the problem is related to the battery. Are you sure it is fully charged? Try recharging it. A battery that sits idle still discharges, although slowly. If your battery has been sitting outside the charger for some time it may only have enough charge to light up the knob, but not to actually drive the modeling.