The first channel is a vox sound. Although it isn't market as such, the tone shaping knobs follow the vox format with the treble actually being a cut and mid the treble. The second channel is fender twin with the expected bass, mid, and treble tone shapers. The switch on the right is for the second channel only and goes from "twin" to "hot." The "hot" setting has more gain/volume but for some reason the tone shaping knobs seem to be removed from the audio path. It sort of reminds me of the master volume setting on the the single channel salvation twin face but I believe tone shaping knobs were still in the audio path on that mod. The bright and pre bass switches do apply to all modes.
