AudioBanter.com - View Single Post - How to separate 1 waveform composed of two tracks

In article writes:

I seem to recall that early talking book recordings on
cassette were sometimes prepared for a special
cassette machine

machines had reverse play and head switching to play a
single coherent mono track continuously from track 1
through track 4.

The thought had crossed my mind. Westinghouse made a cassette recorder that
allowed all four tracks to be recorded on independently. However, Philips did
not like such machines, as they destroyed the mono/stereo compatibility that
had
been consciously designed into the system.

I thought about a special talking book format too, but I suspect that
if it ever really existed, it was gone by the time cassette players
became common in cars.

TEAC had to get a special license from Philips to make the 4-track
cassette PortaStudio because it didn't conform to the cassette track
recording standard format.

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