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The 4MS SISM is a handy 4-channel voltage manipulator module that makes it possible to scale, invert, shift, attenuate, mix, slice, and split both audio and CV signals. The module utilizes red and blue LEDs to display whether the output jack for each independent channel is emitting a positive or negative voltage. While each channel features its own independent output, the bottom row of the module features a variety of different mix outputs that re-appropriate the sum of the voltages at each input in interesting and useful ways.