I started with a simple feedback with delay on audio signals and then tried to find other effects to use on the delayed signal (like the pitch shifted example we saw in class). I tried things like filters and down-sampling, but these weren’t quite as interesting since they’re, for the most part, idempotent, so the 2nd, 3rd, 4th, etc echos wouldn’t sound too different from the first. In the end, I went with pitch shifting + ring modulation.

Here’s an example on a clip from Spongebob (might have to turn volume up a little):

And here’s the patch: