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Explanation about PWM smoothing; essentially a 4-stage RC network but with an eye towards doing it all in one module with lots of analog drum voices; based heavily on Moritz Klein's work, but with an eye towards doing it all in one module with WiFi, https://www.adafruit.com/product/2471 Arduino UNO R2, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf Arduino UNO R3, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 8devices Carambola2, OpenWRT, industrial SoM computer, https://www.8devices.com/media/products/carambola2/downloads/carambola2-datasheet.pdf Pololu Breakout 16-pin 15.2x20.3mm 0.6x0.8\ Raspberry Pi Zero using through hole THT Kemet EC2 signal relay DPDT double dual coil latching through hole Mallory low-profile piezo buzzer, https://www.mspindy.com/specifications/AST1109MLTRQ.pdf Mallory low-profile piezo buzzer, https://www.mspindy.com/specifications/AST12140MLQ.pdf Buzzer, D12.2mm height 6.5mm.

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