Instructables has instructions on how to make a tape cassette that loops.
Looks like it might work!
I just dusted off an old tapedeck I was going to sell and decided against it (since it didn’t look like it’d make more than 10 bucks or something) so I will try to find some time to make one of these cassette loops.
Thanks for the links, will check it out. And hopefully I’ll have some time this weekend to create some 6 second loop tape cassettes with some of my loops.
If you are willing to risk some damage to the deck, check out
http://www.f7sound.com/tapebreak.htm
I think cd-players aren’t so picky so http://www.f7sound.com/cdscratch.htm might be fun aswell.