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On input. Portamento (aka slew rate controller aka glide). Knob version fairly simple. CV version maybe possible, but a much bigger circuit. Haven't found a simple implementation. Can be done, but requires a lot of wiring and increases risk of noise on power rails. Things best left to external modules: CV-controlled CV offset module - add a global/master pitch control/modulation function with a 7-segment display with LED backlight TFT graphical display 480x272 16-bit colour with led backlight TFT graphical display 480x272 16-bit colour with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100CY, light-direction upwards, see http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF PhotoDiode, plastic SMD DIL, 4.5x4mm² PhotoDiode plastic SMD SmatDIL Resistor, LDR 5x4.1mm, see http://cdn-reichelt.de/documents/datenblatt/A500/A90xxxx%23PE.pdf Resistor, LDR 12x10.8mm, see http://yourduino.com/docs/Photoresistor-5516-datasheet.pdf Resistor.

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