Many years ago I saw a guitar in a store that had something like 5 to 6 radio buttons in a row. They were labeled Overdrive, Distortion, Chorus, Flanger, Delay (or something like that). No adjustments except for the usual Tone and Volume controls on the guitar, and the pickup switch of course.
I think they were just set at some generic fixed setting. Never came to hear it, but I guess there was a single MN3007 wired to get some chorus, flanger or slapback delay, plus an Op-Amp with a couple of diodes that you could switch in feedback or clamp mode.
Don't remind the brand of the guitar though. I guess it may have been a nice practice instrument. Not sure if it was a great instrument for band playing, though, since there was no flexibility to setup the controls.