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And bridge out R44 with a capacitor / resistor pair, see Fireball's hard sync 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 manual EG ~$7 in parts, mostly down to PCB edge 7.4799999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector.

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