Features: Drive adjusts the overall amount of gain and overdrive. Active Bass and Treble controls cut or boost ±12dB Mid Shift is a parametric EQ control which allows you to select the center frequency of the Mid control. Its sweep ranges from 170 Hz to 3.0 kHz. This, then, enables you to notch out any specific frequencies that may be causing your instrument to feed back. Mid is also an active tone control, cut or boost ±12dB. Blend allows you to mix the direct instrument signal with SansAmp Tube Amplifier Emulation circuitry. Individual Level control for the XLR out to optimize your amp's output relative to the P.A. system. Effects Loop with Mix 50/50 switch to configure in series or parallel. 1/4" rear input and XLR output with selectable levels. Buffered uneffected XLR output to run a dry signal to a separate channel. Footswitch input to engage unit. [Utilizes any alternating (on/off) footswitch.]