Make:

this was way more awesome the second time! thanks! my only question is: what is a cassette?

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Keep your eye on the "Free" feed from Craigslist. There was a guy begging people to take a couple hundred of his hands in my area a couple of weeks ago. Unfortunately my own personal collection is long gone, but what a project it could have made.

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used to do this in high school.. what a pain in the ass

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Wiki books talks about making tape loops of differents including making a -- Tada! -- Mobius tape loop: http://en.wikibooks.org/wiki/Making_Cassette_Tape_Loops

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Another cool hack would be to have sliding playback or record heads, like the old echoplexers, so you could vary the amount of time between the record and playback.

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I also used to do this in HS, I made Mobius loops as well. If you can find them, answering machine loop cassettes are awesome, they come in 15, 20, 30, 60 sec. flavors!

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If you Circuit Bent a Cassette Player by installing a Tape Motor Control Mod like This one Caspar Electronics added to a Barbie Karaoke Machine, you could tweak the loop as it played, slowing & stretching the sound or speeding up & shortening it.

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I use loop cassettes (sometimes my own, sometimes answering machine tapes) in four-track machines. I wrote a whole article about this technique, it's really interesting (also really cheap, these days). I also have an ongoing project I call Repetitive Miniatures, which is nothing but recordings of cassette loops I've built up with the four-track.

It's definitely a bitch to make your own tapes, but you can sometimes still find splicing blocks at Radio Shack which help a lot.

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