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Expanding out to 8 notes means ~$16-20 in parts, two tl074 op amps and otherwise a bunch of wires backwards e6b834b08c Fix floating pin for Pause (J19/J18); the schematic is incorrect Ins: Clock In Normal - 1k to U2-8 (AND NOT short to U2-10 - Clock Rate - variable resist +6k between U2-8 and U2-9 Reset Sw - when pressed, short +12V and Reset In socket Reset Socket to U3-3 = capacitor measurement roughly 15nF (has a resistor footprint between +12V and Reset In - U1-13 (can get at from top when assembled Stop Switch - 10 ohms between U1-14 and U2-1 when off, more like 1M when off - Single Step - 12V through 10k Ohms to U-1-14, more like 1M when off Glide In - U1-13 (can get at from top when assembled Stop Switch - 10 ohms between U1-14 and U2-1 when off.

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