The Hi-Gain 100 SER features a clean channel (CH1) that uses the same circuitry as in their Custom amplifiers. Push-pull bright/normal switch offers the same dual channel priciple of HiWatts Custom 100 and 50 models. Channel 2 (CH2) dials the biggest sounding distortion with awesome bottom end for all your drop tuning requirements. In addition it features Accutronics reverb, fx loop, and amplifier mute (so you can use the pre-amp on its own through the specially-designed speaker emulation circuitry).