"William Sommerwerck" wrote in message ...
It may have been a quarter-track stereo machine.
These record two tracks in the same half of the tape
that a half track stereo machine uses for one track.

NOT SO! Quarter-track quarter-inch machines have interleaved, not adjacent,
stereo tracks.

I don't think you read what I posted. I said "two tracks". Not stereo tracks.
That is why you would get forward and reverse mixed.

Steve Lane