Available as an assembled Module and as a DIY project.
This Module is currently available.
Binary Step Sequencer with 30 patterns
Polygraf is a step sequencer that features record/edit and playback functionality across 32 different patterns of up to 16 steps.
Polygraf has four binary outputs (can be High or Low), labelled One, Two, Four, and Eight. During playback, Polygraf outputs a combination of High and Low for each of those outputs. The combinations can be edited by setting Polygraf to write mode and following the necessary procedure.
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These merchants probably sell this module. Huh?
Frequency Central Polygraf (Binary Step