Wavelord - no sounds when ON, only "whooshing"

[Dynamgp]

Hi to all,

I am looking for some help and guidance on the wavelord PCB.
I have built some pedals already with success but I am not an expert in electronics and all theory behind.

To recap : The effect doesn't work when engaged and only very light "whooshing" sounds can be heard.
And those sounds are actually changing based on the bank and waveform choosen from 1P8T and based on the tempo and/or tap tempo. Even changing T1 trimmer has no effect (the "whooshing" sounds only increase a little).

-Bypass switch is working properly and correctly wired. When the effect is off guitar signal is passing.
-Tap tempo is functional. Based on led output in line with tempo tapped on the switch and the fact that the "whooshing" sounds react to the tempo tapped.
-Voltages for IC1 TL072 and IC2 TAPFLO3 are in line with what is stated in the build documentation.
-I am using a VTL5C9.
-No components seem to overheat as far as I can tell.
-No shorts between components as far as I can tell.

Any idea what to look for next to try and debugg ?

What should be the normal voltages for Transistors ? MPF102 and the other three 2n3904 ?
Is there a way to test those to know if they are defective?

Same for the VTL5C9 ? (but since the "whosshing" sounds are modulated, it should be working... correct?)

Many thanks in advance, your help would be greatly appreciated

[Dynamgp]

Hello to all,

With some pictures attached of the build