from ladyada mods page: Detent Tuning knob When we designed the x0xb0x, we put in a non-detent tuning pot because that was what the original 303 had. However, this may drive you a little crazy. Panasonic part number P3I9503, an equivalent 50K linear potentiometer with a center detent, is available from DigiKey. Note that you may have to retune the synth once in a while to keep the center detent 'correct' 'Tuning' knob by default is coming without detent, but can be substituted by one with detent. P3I9503 POT 50K OHM 9MM VERT PLA BUSHING @mike: then, my guess, the list is missing 2 (or 3 if tuning not substituted) of 50K D log pots: P3L2503 POT 50K OHM 9MM VERT PLA BUSHING and, USB B-type Jack is not in the list as well. i also need some minor 2 resistors which i couldn't find on futurlec