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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 buffering between (some) stages. Needs a TLC7524/AD7524 (a simple DAC that's still sorta analog) and a switch of some that get squished or have excessive padding. This requires hardware de-bouncing to avoid multiple triggers on each - Could replace step IDs with a 7-segment display with LED backlight 128x64 RS-232 I2C or SPI LCD 4x10 character 3.3V VDD I2C or SPI LCD graphical display LED backlight http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft43-ae.pdf TFT-graphic display 640x480 16 bit colour TFT-graphical display 800x480 16-bit colours with capacitive touch panel http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft70-ae.pdf TFT-graphical display 800x480 16-bit colours http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft70-ae.pdf TFT-graphical display 800x480 16-bit colours and touch display STN/FSTN LCD 128x64 dot https://www.digchip.com/datasheets/parts/datasheet/1121/AG-12864E-pdf.php AG12864E Graphics Display 192x64 2 Digit 7 segment LED display Double digit seven segment super bright yellow LED 4 digit 7 segment ultra bright red Dubble digit green 7 segment LCD 6 digit 7 segement super bright yellow 7 segment LCD Double digit seven segment green LED One digit 7 segment red LED with left dot SA15-11xxx single digit 7 segement blue LED 2 digit 7 segment LCD Double digit seven segment hyper red LED One digit 7 segment green LED, http://www.kingbright.com/attachments/file/psearch/000/00/00/CA56-12SURKWA(Ver.8A).pdf 4 digit 7 segment display 38.1mm 1.5inch single digit 7 segement blue LED with right hand decimal, https://docs.broadcom.com/docs/AV02-1589EN 2 Digit 7 segment ultra bright red Dubble digit green 7 segment green, https://docs.broadcom.com/docs/AV02-2553EN One digit 7 segemnt blue LED, right hand decimal 10-Element Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Yellow Bar Graph Array 10-Element Red Bar Graph Array 10-Element Green Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Red Yellow Green Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Red Yellow Green Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Red Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Green Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Red Yellow Green Bar Graph Array 10-Element Yellow Bar Graph Array LCD 16x2 Alphanumeric 16pin 16 x 2 Character LCD, http://www.vishay.com/product?docid=37299 LCD-016N002L 16 x 2 Character.

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