1. Fill the Clean Blend section on pcb v2.3 as normal, except:
   • Omit the 1uF under the Self-osc pot
   • Omit the 47k under the Noisegate pot
2. Solder the + end of a 1uF into the + hole of the 1uF omitted above
3. Solder the - end of the 1uF to a wire which goes to the signal of the Ext Audio input jack (make sure the jack is grounded to the box or powersupply)
4. Solder one end of a 100 ohm resistor to the “right hand” hole of the 47k you omitted above. When looking at the component side of the board with the text facing up, the “right hand” hole is on the right (next to a 1uF) ... diagram, anyone..?
5. Solder the other end of the 100 ohm resistor to a wire which goes to the LFO insert point. This is the top middle pin of the LFO on/off switch (see the Ext Audio diagram)

You can use the same drill layout, since you’ll be using the Clean Blend pot as the External Audio Gain pot (1M linear).