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The 1N34A diode creates asymmetrical clipping when used in conjunction with Q1 and Q2.  Replacing it with a jumper will produce symmetrical clipping.  This may result in a subtle tonal change.

If you are using a 3PDT wiring board to mount the LED, you will install the CLR (current limiting resistor) on the 3PDT board instead of on the main board at R14.