[sdiy] Automatic Double Tracking/ slapback device

[danial stocks]

>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?
you could install extra tape head on the other side of the cassette like the 
erase head is  but on the other side - so then you have
erase-record-playback

Can the motor speed of a
>cassette deck be harnessed and adjusted via potentiometer?
yes, there is usually a trimpot inside for setting the speed. just need to 
find it and make it inot a pot. it is usually located near where the motor 
wires attach to the board..
Cheers,
Dan
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