CultureJam Neptune Delay

Another PT2399 delay from CJ.  An LDR with greater than 1M dark resistance and preferably less than 100K light resistance is recommended.  I put the resistors in between LDR and LED to add a bit of separation so you can get them facing each other more easily.  As usual with these, it's recommended that you tape LED and LDR together or use some heat shrink tubing so you can test the circuit without it needing to be boxed.

Info from CJ about his project

Here is my two cents thrown in to the bucket of PT2399-based delay circuits. It features aggressive low-pass filtering on the delay line to virtually eliminate the nasty artifacts that often plague PT2399 delays; and it also sports a momentary footswitch that modulates the delay time, allowing for some cool pitch-bending sounds and really funky detune effects. It can also be made to sound sort of like a lap steel (in a way).

The base of the circuit is derived from madbean's "Sea Urchin" circuit. Then cranked up the filtering and added the modulation footswitch.

More info can be read in the project PDF posted here.