Effects With Output Only?

[Literally Elvis]

I know EHX makes the Crash Pad/Space Drum/RTG, but I'm wondering what other pedal-format devices there might be that accept no input?

 

[chankgeez]

Stuff that oscillates?

 

[ERGExplorer]

There are all kinds of surprisingly expensive stochastic synths, and even synths which just rely on twisting knobs instead of having an interface more capable of what most would call music.

Not my thing.

 

[Black_Label]

Oh, you're thinking of a guitar. It's that thing we should all be practicing instead of posting on here.