A Logic Cookbook for Synthesis

Sub-octave generator

Attibution: mdoudoroff, Synth Music Blog

flipflops will hold low or high until something causes them to flip

If you patch a square wave (at either audio or sub-audio frequency) into a flipflop, you get divide by two from the output (an octave lower in pitch). If you patch that output through a second flipflop, you get divide by 4 (two octaves lower in pitch). You can use the same principle to derive /2 and /4 clock divisions.

Note that some logic modules offer flipflops with other labels, such as “/2” or “SET/RESET”.


Video example (begins at 5:31):

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