Cutec AD-01 Analog Delay

[Northernpike]

Greetings!

I recently picked up a Cutec AD-01 Analog Delay pedal.
The "mix" function does nothing. Looking for a schematic or some advice.

Thanks,
Tom

[The Dude]

This should be very similar if not identical.

https://saturn5tony.files.wordpress....4/03/de-80.jpg