Purple Plexi 800 by Mark

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Purple Plexi 800 by Mark

Lobbetto
This post was updated on .
Hello guys!

I built the layout of Mark "purple plexi 800" but I have a problem with the gain.

Let me explain, when I closed the gain throughout the volume is acceptable, but if you increase the gain as a result the volume decreases, and when I opened the completely gain the volume is very low.
The pedal functions as it should if it were not for this inconvenience.

How can I fix?
Thank you! if you need help I can also write voltages of the IC

1) 1,285            8) 1,285
2) 0,00              7) 3,81
3) 0,16              6) 7,80
4) 0,00              5) 5,58