Reply to Gain Knobs S4

Is it normal that my gain knobs from the deck i am playing are turning on in TP2. I'm not even using FX effects , and seriously i don't even understand what gain knobs are used too. I'm trying to record a little mix and in the middle of my project it sounds crappy , i look at the gain knob , hit it and sounds normal after , wth ?

Any help plz