Designed for use with the MOD Footswitch, and a Ditto stereo looper splitting mono into stereo at the front of the chain, with one channel reaching input 1 of the DUO via the FX loop of an Audio Sprockets ToneDexter, and the other channel direct to input 2 of the DUO. This allows the DUO to control a wet/dry mix of the raw signal with the one processed by the ToneDexter.