Hi, I just bought the Firehawk FX second hand. I will play mostly via my headphones. Unfortunately there is a lot of hum via the headphones. Especially when using a lot of gain (presets like sweet child of mine, etc.) When i bought it, i tested the firehawk via an amp. When testing via normal speakers there also was a hum, the seller said it was the guitar and clicked the amp button and the hum/noise was gone. My question for seasoned Firehawk users: when using headphones with a high gain preset, do you hear a noticable hum? Or is there hardly any noise when not playing?