<p>I built two and can confirm that with one mono mini-cable I can lock two together and the first one's rate knob controls both.  In my live setup I use either Tom bugs or eric archer machines as externals into each, and other time I use fm3 or real buddha box chants so that while "left" and "right" machines are setup similar they process radically different material through those lovely dual filters.  That sort of gear easily sits atop the housing and the cables are the same, so I have noise lead solo machines w/steady rhythmic drones literally underneath.  Make a tidy complex rig, fits in a backpack.  No power supplies either!<br />
Also use nathan audio's space baby delay, thumbs up on that kit.
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