Dual (serial) PT2399 delay
http://djjondent.blogspot.com/2015/10/delay-no-more-nonlinearcircuits-build.html
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"This module contains three individual cowbell circuits based on those in the TR-808. The main differences are pots on the panel to alter the frequencies and input jacks to patch in external signals to replace oscillator #2 of each circuit...The accent input is tied to the trigger input via the switch tab, probably best to use a gate rather than a trigger to get the sound going, but that depends on what you want to do. Otherwise patch whatever you like to make things happen."
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