"Ben Nguyen" wrote ...
I have a bad audio tape that contains both sides of the tape recording
on one side. So when played you can hear both sides at the same time
with one track backwards.

You are not playing it back with the same head configuration as it
was recorded with. There is no substitute for using the corresponding
geometry to play back the tape.

Sonic Foundry has a reverse feature but I cant separate the 2 sides so
that
I can reverse just one (The audio clip shows up as just one waveform.)

Once they have been mixed together (whether magneticaly, electically,
or acousticaly) there are really no practical methods of separating them.

Is there a way to filter the waveform into its 2 track components?

No. You must find a tape machine with the same head arrangement
(2-track, 4-track, whatever) as the tape was recorded with.