Quad Op-Amps?

[sfr]

I've got a few Quad op-amps lying around, and I'm no projects at the top of my list right now - can anyone recommend a project that could get these things into use?  Maybe I should make a quadrophonic distortion box or something.  

[Ansil]

build the double drive.. it you can drop off the first input amp since it is a comparator, if and the last one is the same or the next to last i couldn't find the link i started one of these a while back.  it needed de bugging but had a nice sound. all the same