Unknown trace origin

[irondemigod]

Hello!
I am currently making a schematic from an audio board I found somewhere.
During this, I found a trace coming from a capacitor, to the input of a potentiometer.
The other pole of the cap is connected to ground via 1kOhm resistor.
I found a cap similar to this, connected to the other pot input.
(attached image of circuit board part)
I need help figuring out where the trace comes from/ if and why it starts from the capacitor pole
Thanks!
(attached image of corresponding part in my schematic)

[pcprogrammer]

Are you sure that it is a potentiometer and not a rotary encoder. It looks like the capacitors are for de-bouncing. The way I reverse engineer this kind of boards is with a DMM and use the connectivity check to look for where a connection is going to.

[irondemigod]

Yes, it is a potentiometer. a thumbwheel dual-pot
https://components101.com/resistors/thumbwheel-potentiometer-5-terminal
also, the traces in question leads to the positive audio inputs of the amp IC (IN1+ and IN2+)
isn't debouncing used for buttons?
i have attached more pictures in the original post. please check them out

[pcprogrammer]

isn't debouncing used for buttons?

Correct, and that is what more or less is inside a rotary encoder.

But for a potentiometer filtering can also be useful, and that is what capacitors in combination with resistors do. Filter.

I will check your added pictures. 

Edit1: Pin 1 of the potentiometer is connected to ground, and my guess is that the left and right inputs are connected to the pins 4 and 5. On the backside of the board it might be that the signals are lead to the other side with vias, but I'm not sure about that.

Edit2: After a better look it seems the signals are connected at the other side of the capacitors and come from the two transistors below near R157 and R172, and the capacitors are for decoupling to get rid of a DC component.