Retrograde "pumping"

[Vallhagen]

Hi!

I am just finnishing my retrograde; i am running the fully populated PCB at my test setup.

*) The circuit seem to work as it should, but it is "pumping" when i play staccato or "chugga", especially when the Fuzz pot turned up high. If i play Strum->quiet->strum->quiet the circuit is really "breathing in breathing out".

I suspect that this is as it should be and somehow caused by the transformer?

Cheers

***
Edit: Sorry, i missed the 4-point form for the tech help board. Here you go:

1) Madbean Retrograde.
2) See *) above.
3) No steps really. I have re-checked the component values, but the question remains if this is really a "feature" or a "fault".
4) Nothing substituted.

[Jean-Rock]

Same problem, anyone can help ??