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Proving that red and green really do clash with purple.
Transporter unifies the various different methods of play/stop control on sequencers, piano rolls and other stuff. Some use a gate signal that is high for Play and low for Stop. Others have separate play and stop trigger inputs, and things like the Mighty Piano Roll have a single input trigger that toggles the Play/Stop state on each trigger.
Transporter accepts and generates all of these signals, as well as having handy play and stop buttons of its own. It's particularly useful when using Voltage Modular as a standalone program rather than driving it from a DAW.