I have been reading up on the PT2399 echo audio processor, and a good way of seeing one action is to pick up one of the many delay effects pedals.
The kit I found is nicely put together with a pre-drilled and decorated 1590B enclosure, and some very nice knobs and smooth pots. The build was a breeze, and results are actually pretty decent. As always, all notes and schematics are in the Little Electronics & Arduino Projects repo on GitHub.
Here’s a quick hit to demo the effect, with a clean guitar signal and all the effect settings on “11” (mix, repeat, delay)…