31 ESP
ESP processes incoming audio through a gain stage and bandpass section, then derives envelope, gate, trigger, and pitch control signals. Main controls preamp gain, X sets lower cutoff, and Y sets upper cutoff. In switch middle, pitch updates are held unless gate is high; otherwise pitch tracks continuously. Audio Out 1 is post-gain signal and Audio Out 2 is bandpassed output.
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README
ESP
A MS-20-style External Signal Processor that includes a preamp, bandpass filter, envelope follower, gate, and 1v/oct pitch outs.

UF2 build at /UF2
PDF Documentation at docs/ESP_Card_Doc