Bitcrusher/bitswapper/sample rate reducer module

Schematic reminds me of a certain Jedi. The ADC0809 is rated for absolute maximum voltage -0.3 V to Vcc+0.3 V on its input and output pins. There’s nothing here to protect them.

In particular, presumably the audio in here is supposed to be in the 0–5 V range, not ±5 V, not only to stay within spec but to make it actually work over the full waveform.

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