Also this. More of a vocal tool than anything, I used it for live harmony BVs with a band I was in many many years ago, since when it's been gathering dust. It's been around the block as you can see by the rack ears, but it's working fine. I never tried it with instruments, I imagine it should work for them too. It's too big to be a paperweight and the wrong shape for a doorstop. I've got a copy of the manual knocking around somewhere. No power supply, but it takes a bog ordinary 9v power supply and only draws 250mA.