Hi thanks for the ideas. Unfortunately, other than taking some of the hum down, the expression-button trick didn’t bring the delay signal back. If I adjust “Blend” to 100% wet (delay signal), there is just hum (and the clock sound if “depth” is maxed out, which is probably normal).

So to summarize, everything lights up and the dry signal goes through as it should when the pedal is bypassed.
But with the pedal on and the “Blend” knob fully counter-clockwise, there is the original dry signal, but as the knob is turned clockwise, the dry signal fades as it should but the repeats (delay signal) are not present. just hum noise (and clock noise with “Depth” knob maxed out).

All the chips are well socketed, and nothing smells funny.

What can be wrong here!

Thanks again. folks!