First time i've found what i think it's a passive eq on a amplifier... Long story short, even if you have your volume at 12 o'clock for example, if you turn all eq left to zero you get a silent amplifier!!
So, that leads me to think that in fact what you have for an eq is 3 tone controls in which you allow more frequency to pass in 3 different frequency centers.
Imagine a passive guitar or bass with 3 tone controls, centered at different frequencies (bass, middle, high). Instead of cutting only the high frequencies like any other bass or guitar you can cut all frequencies...
So what you get is a "passive eq" amplifier...
Overdrive channel also sounds like crap.
Please don't buy this, for your wallet and sanitys sake.
As i didn't expect much i'm not going to go through the trouble of returning it, but i did expect more from Thomman.