I just purchased a used HD500x and have been having trouble getting useable tones out of it to say the least. It seems as if the unit is not simulating the amps i want or if it is is not effecting tone virtually at all. This tone was using the son of plexi with all the knobs at 12 with everything except the amp removed. The sound I got out sounded like I plugged my guitar straight into the board, maybe with a little more gain. The effects units work and the higher gain amps have more gain than the lower gain amps however I cannot shake it that the sound that I am getting is as if I plugged straight into the board and any variation between the amps is so slight and they dont seem to have any characteristic, it is not that I am saying the simulation isnt accurate, it just doesnt sound like my signal is being amplified or sent through the amps circuit. I need some help determining the cause. I put it into stereo direct mode and troublshot as much as I could. My cables, powersupply, headphones, audio interface do not seem to be the problem. I made it so input 1 is guitar and the other is mic, the impedence is at 22k, modifying any of these things makes no difference. In this attached file asdasd.mp3(WARNING THIS FILE IS EXTREMELY LOUD FOR SOME REASON TURN DOWN BEFORE LISTENING) the audio is constantly clipping, the only way to stop this is to lower the volume to unhearable levels. The problem is not the interface either as it makes no difference to plug my headphones directly in or into the interface, the tone is virtually the same, it doesn't sound like the amp sim is working. If anyone has has this issue or has resolved it I would greatly appreciate some help.