Check the listing for details. One Control Minimal Series Stereo 1 Loop Box - True Bypass Looper. Condition: New. Listed at 175.64 USD. The One Control Minimal Series Stereo 1 Loop Box (MSS1LB) is a true bypass loop switcher designed specifically for dual amp stereo setups or for recording and live situations where you play directly into the mixer. All jack connections on the MSS1LB (input, output, send and return of the effects loop) support TRS stereo jack plugs. The Stereo 1 Loop Box has an M/S switch for switching between mono and stereo operation. If the mono input signal is converted to a stereo signal by the effects pedals in the effects loop, the output is also stereo. The footswitch can be set to either 'Normal' or 'Rapid' in two selectable modes. In the N ('Normal') position, the switch acts as a latching-type switch, turning the loop on or off each time the footswitch is pressed. In the R ('Rapid') position, the.