I sorta just discovered this input this week. Its always been there, but originally, I wanted to be a purist and just crank the amp to 10. for this purpose, the higher treble response of input 1 (I don't have a bright cap installed...btw) was better for the cranked tone. BUT, now I use a pedal as my main overdrive and put it into the normal input and keep the volume around 5/6. I found this to be MUCH MUCH more musical sounding. The only difference between the two inputs is the mixer bypass cap (560pf) and I'm rather shocked how much that little cap seems to add nasty sounds to the guitar signal. Research has shown it to be a sort of EQ boost at roughly 1K and I think thats a harsh frequency to focus your guitar around. Then, when plugged into the normal input, the bright volume pot then seems to act as a 1K boost knob since with the volume off, I think the circuit is then bleeding the 1K resonence to ground. Turning up the pot lessens that effect. Its very complex! I'm still experimenting, but I seem to find this normal input to be far musical in general.