Mutron Octave divider (byoc divided octave pcb)

[baloubass]

Hello everyone, i build a octave divider based on the byoc pcb, work great.
Now i'm looking to make some adjustment. When i switch the ringer "On" the volume just really drop.
If i want to control the ringer volume do you think if i add a pot between:
C20 and R31 it's will work?
In fact i don't understand after R30 what C20 and R31 do in this cricuit.
Before it's a green ringer schematic i'm ok with that but after...
Thank you.
Schematic (look around IC1A):
http://byocelectronics.com/dividedoctaveschematic.pdf

[Scruffie]

R30/C20 form a low pass filter @1.6KHz.

If you want more gain, just reduce R31.

[baloubass]

R30/C20 form a low pass filter @1.6KHz.

If you want more gain, just reduce R31.

Ok thus if i want less gain i have to increase R31.
I have think about an other thing:
1)The Switch just connect the ringer section to ground or not. If i put a pot in place of this switch normally it wil work ?
2)The R32 can be replace by a pot as a volume control of the output of Ic1a
I wil test with the R31 resistor.
A pot