LowRider troubles with 2nd Octave Down

[Rockhorst]

I just tested my LowRider build and it almost works, but there seem to be some problems with the 2nd Octave Down. Clean, Oct Up and 1st Oct Down work perfectly fine. The 2nd Octave Down is very much louder than the other channels and when idle (not playing) there's some weird ticking going on. It's not a constant tick, but it does seem to have some regularity to it. Kinda like the pedal sending out Morse code (tr-tr-tr-tr stop tr-tr-tr or something like that). This happens even with my hands on the strings and I can sometimes briefly shut it up by moving my hand slightly, but then it starts again. This would suggest to me some grounding problem? I think my IC readings support this idea, see below.

I've checked the IC voltages with the ones in this topic. Below are my values (half supply is about 5V), the ones I think are off/peculiar are in bold typeface. What I find odd is that it only manifests (at least audibly) on the 2nd octave, yet my readings of the 4013 ICs quite different with the reference ones. Is this consistent?

IC1:  TL072 checks out fine

IC2:  LM324
1  4.9 - 5.3 (periodically goes up and down)
2  5.1
3  5.1
4  9.5
5  5.1
6  5
7  4.9
8  2 mV (stays steady at this and doesn't go down to 0)
9  5
10  5.1
11  0
12  5
13  5.1
14  3.9 - 4.6 (periodically goes up and down)

IC 3:  CD4013 (9, 12 and 13 are really disturbing here, compared to the reference).
1  0
2  9.5
3  0
4  3.9 - 4.6 (periodically goes up and down)
5  0
6  0
7  0
8  0
9  0
10  0
11  9.5
12  0
13  9.5
14  9.5

IC 4:  CD4013 (lots of differences here)
1  0
2  9.5
3  0
4  0
5  9.5
6  0
7  0
8  0
9  0
10  0
11  0
12  0
13  9.5
14  9.1

IC5:  TL074 checks out fine

IC6:  TL074 checks out fine

Any suggestions?

*Edit*: Just to clarify, when playing everything is fine, also on the 2nd octave down. But when I stop playing it makes noise, sometimes intermittent like Morse code, sometimes a constant chop-chop-chop like there's a helicopter in the room, and it's quite loud. It's seems periodic, which makes me suspect something with the clock? At the moment it's a pedal that literally demands you keep playing

[Rockhorst]

turned out to be a bad pot!