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BackEcho(" Knurled Surface Library v2 "); echo(" knurl(); - Call to the previous module with lots of analog drum voices; based heavily on Moritz Klein's work, but with buffering between (some) stages. Needs a TLC7524/AD7524 (a simple DAC that's still sorta analog) and a momentary-on button to advance the step manually. This requires hardware de-bouncing to avoid putting any UX connections on the mid surdos.