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Three cowbell circuits after the TR-808's, with knobs for both oscillators' frequencies and an input that replaces each one's second oscillator. The filters are fixed as in the original, so a voice is loudest with its oscillators near their range. ACC takes TRIG with nothing patched; a gate rather than a trigger gets the sound going best.

Key features

• Three voices, each with TRIG, ACC and EXT in and OUT
• FREQ1 and FREQ2 knobs on each, one per oscillator
• 8 HP; Nonlinearcircuits publishes no current draw, depth or assembled price (it sells the DIY PCB and panel), and ModularGrid lists none