[sdiy] Automatic Double Tracking/ slapback device

[Jon Darby]

Howdy, everyone,
    I was wondering how difficult it would be to modify a tape recorder to
record an input signal directly before playing it back along with the
original signal but slightly delayed to produce that Beatles double tracking
effect? I can imagine it is possible to make an infinitely looping cassette
tape by cutting a length of tapejust long enough to loop around the rollers
and the tape-reading area and maybe held tight on the rollers by a small
spring tensioned wheel in the middle. Am I dreaming or is this a possiblity?
I would love to have the ability to speed up and slow down the delay while
playing for whooping-effects on the synth, too. Can the motor speed of a
cassette deck be harnessed and adjusted via potentiometer? I haven't torn
apart a tape deck since I was a kid, so I think I'll pay a vist to the
thrift store after work for a test specimen. Any known articles on this
would be a great help! THank you!


Your pal,
Jon