Hi Hats very low volume [SOLVED]

Hi,

Now the problem is solved but I had big headaches finding it.

The hi hats were at very low volume, barely audible, but both decays and the volume were working fine. This is the 2nd Nava I built so I could compare the hihats circuit to find the culprit.
I naturally started by checking around IC111 (accent) and IC112(trig) with a scope, same results on both Navas, so I thought that they were working fine.
I jump to the analog part, everything look identical until the 2SA798, so I swapped it with the one from the Ride circuit, same result as before, Hihat still low.
So I checked Q52, swapped it, same. I checked for the 10th time if every value/orientation is good (which is).
I had a give up for a few days, and today I tried to swap IC111 with the one from my working Nava and now it works!
It's really weird cause both the faulty one and the good one were displaying the same voltage variation on the oscilloscope at pin 15, and all other accent provided by IC111 were working fine, could it be current related?

IC111 has probably been damaged because I couldn't trim TM2 to get 5V, IC118 had a cold solder joint, resulting in IC110 outputing 10V and the trimmer wasn't doing anything, and since IC111 is powered by +5V, the 10V at the input must have been lethal. Still weird that it was half working though.

TLDR: hi hats low volume = dead IC111 (CD4051)

Hi Bastien,
The very same problem happened to me today as I was trying to debug my crash and ride. Now I can hear the hats and the decay works for both closed and open but the volume is way too low

Thanks for sharing your experience

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