Shruthi XT with LP2+Delay - delay doesn't work

I have a small problem. I got a Shruthi XT with LP2+Delay filter card. plays nice, just the delay doesn’t work. I have no idea what it may be. can anyone advise me? Thank you very much.

Experiencing the same issue. Did you end up solving it?

This is a common problem with the delay chip used in these filters, PT2399, and this issue is documented in the build guide. The solution is to replace R58 with a higher value resistor, this can fix the problem at the expense of longer delay times (both maximum and minumum) or use different PT2399 chips until you get lucky and get one that doesn’t latch up.