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Indicator arrow on the footprint. Some options: Bourns PTL series, such as: https://www.mouser.com/ProductDetail/Bourns/PTL30-15O0-105A2?qs=fV9UsjselOEqdQiKFAm%2Fog%3D%3D (A1M, orange LED, 30mm travel, 15mm shaft * https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft ** https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M * The SPDT toggle switch ON-ON | | | | | | C2 | 1 nF | Unpolarized capacitor | | | | R25, R27, R29 | 3 | 1k | Resistor | | R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols | | | Screws, nuts, and spacers (see build notes The build is pretty straightforward except for mechanical assembly, and one 16-pin IC. But 3 panel-mounted UI elements for every step (plus some others), so plenty of room for a press-on type knob (rather than using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a narrow space between two resistors **Corrected:** Updated C5 and C14 with more panel layout Initial stab at a 10-step panel layout # Using the Precision ADSR build notes The build is pretty straightforward.

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