I've built a few audio effects that only I've used. The only one that really stuck around is a guitar pedal delay effect with pitch shifting where the pitch shifting only happens on the first repeat, it doesn't accumulate as the sound repeats. It also has an envelope follower so notes can repeat infinitely when there's no playing, and once you start strumming/picking again the feedback of the repeats drops to zero until you stop playing and it goes back to the knob setting (Which can go from 0-150% feedback). Unfortunately I've got no good sound demos except some Facebook videos I'm not willing to share ;p
replies(1):