Hi there, I just bought Aguilar Tone Hammer 500 and I noticed that it is noisy when I try to increase a volume or gain. I'm not playing in the same time. Horn is turned off. Treble is flat (at 12). The question is if it's typical for Tone Hammer? I recorded it: If it's normal, I can live with that, but I'm just afraid that something is wrong with this amp. Thx.