There's a whole bunch of them, free, paid, looks crummy, looks incredible, etc. I am mostly interested in ones which "destroy" the signal in a haze of noise and/or distortion after a few passes. I am thinking specifically of something like the effect on the voice in the Moody Blues "Sunset" from Days of Future Passed, if you know what I mean. It may not even be a tape delay. I know a Space Reverb has 4 heads and a spring reverb etc. and that may all be cool but I am really looking for that sonic destruction more than anything.