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Bitcrusher Rev B. I’ve added buffering for both the input and output stages to improve impedances and help isolate the effect from other items in the signal chain. The actual op-amp chip used is the MCP6024, which has a much wider bandwidth than the MCP604 shown here. Eagle doesn’t have a symbol for MCP6204, but they have identical pinouts.

Many thanks to your friend and mine, Matt Baker for his help with AC analysis of my original design. Matt’s a very smart guy who went to Purdue with me.