There could be damage to the IC that was powered up with pins out of the
socket.
With the MIX full wet, delay may not be apparent because there is no
reference. You need to add some dry signal and make some changes in the
input signal frequency to hear the effect.
If you use a short delay and add in some LFO, you should hear some
flanging type sounds.
Regards,
___________________
John Blacet
Blacet Research
http://www.blacet.com