Ah that was a J, I thought it was a T. I had a suspicion it was 6.8nF, but it seemed low since 0.047uF and 0.022uF were the values I was seeing. So I thought there was some magic code I was missing.

They actually gave me 3 log pots in the kit, so I used two of them for tone. That definitely explains why nothing happens. I'll try getting 0.022uF next time I can get to Jaycar.