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Mix or sum any signals (av or audio) into four groups. 12 inputs are on the left, and the central switch is used to group them in any of five channels (#0-4). On the right, you'll find that everything on the same channel is now combined at the output (and cloned at every other group member's output). A switch just below the "O" (of "Playertron", top right) selects whether the signals are mixed (averaged), summed (added), or clipped (added but cut off at +/-5v). Additionally, the group number can be modulated, so you can dynamically change groupings for exciting variations of signal combinations. The green button at the top-right can be pressed (it turns red) to make channel #0 a mute channel - anything assigned to O gets output as ov. The other green switches also allow you to toggle individual rows on & off.
Try sending it diverse modulations, then use CV to redirect them toward a mix of destinations. Give it triggers/gates and use it like an OR to mix and divert rhythm patterns from sequencers. Feed it waveforms to mix and match combinations on the fly.