Cut a strip of tape about 2 
    feet long.
    Splice the ends together. 
    (This will be our looping tape.)
    Put the tape on the new wheels and over the play record 
    head.
    Now start the recorder and record. Every time the metal part of the 
    tape reaches the sensor the track automatically changes to a new 
    track.
     
    Okay that was the foundation of this new looping device, however now 
    the fun begins as there are several additions that can be added. Such 
    as:
    1] Add additional play heads 
    2} Add switches that turn on and off the left and right record 
    channels.
    3} Add cassette record heads
    4} There is a metal strip that changes the tape track (program as it 
    was called in the seventies) This can be used as a randomization trigger. 
    Imagine placing a metal strip at 3 other points on the tape and engage 
    record. Now what will happen is the tape will 
    record, but at certain points switch to a new track and record there. So now 
    you have random material on different tracks. Also you could place metal 
    strips at different points along the tape path so the tape would switch as 
    it plays.
    5] Add a switch to the sensor so that you can switch tracks 
    manually...again to add random recording. Or used during play back to switch 
    tracks randomly
    6] Add another play record head and reverse it. This may or may not 
    work.
    7] Use better quality audio tape. 
     
    You see the potential... This takes the musique concrete approach to 
    a different 
    place.