Octaking W taper voice pot

[Smrtokvitek]

I bought the Octaking as a kit from Musikding because it seemed less of a hassle in sourcing parts and paying import fees to Europe for the PCB. I was right to a certain point. The kit was missing one capacitor (not a critical one, the clean bright/low dip switch cap), and the voice pot was not the W-type taper but a linear B50k.
I have tried to approximate the taper using a 33k resistor from each side of the pot to the wiper. The resulting function is kind of strange. It has some effect only in the low or high 15% of the taper, and at both ends, it rolls off highs. What is the original function of the voice, and how does it work in the circuit?
Should I just use the linear pot without the approximation?

It looks like it should work like a regular "tone control" in the KingTone video.

 

[darwin999]

Hmm, you could try out a linear of the same resistance, and see how it adjusts. - if you can, try it on a breadboard or not mounted in the enclosure (so you can replace it easier).

 

[Smrtokvitek]

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aionfx.com

After finding and reading the AionFX trace, I think the problem might be the pot's effective value. When using a 50k pot with 2x33k, the effective resistance at the end of the taper is about 20k and about 28k in the middle. That might be a bit low.

I might try a 100k pot with 2x68k and get about 40k at the end of the taper and about 56k in the middle. Just my guess, to be honest.