Moodring voltage issue on IC4

[WAXOU]

Hi,

I finally get to build the moodring that was sitting on my desk for quite a while now.

The effect works pretty well. Still, I've checked the voltage and noticed two differences with Brian values.

I find 2.22v dropping to 1.6v on pin 5 of IC4 and 2.52v on pin 3 on IC4. Every other IC are in the range of Brian's value.

I've suspected R27 to be faulty for pin5 so I've replaced it but no change.

Does any of you guys have any clues ?

(Maybe it's not that bad since I found the effect to be nice :-))

Thx