My build progress

[zorch]

Not sure if this helps in any way, but some work has been done on this already.

Adding sync to an LFO

So I started off with the David Hillant LFO design: [Screenshot_1] I have it working on my breadboard. Now I would like to add this: [lfo_sync_r01_magic_smoke_electronics_142] Apparently I cant just plug this setup in to the existing circuit (I tried). I imagine because the resistors are the wrong value. Any ideas on how I might get this to work?