2 ms·Only if stereo. You only need 2 tracks for mono. One for each side.by rusk 6y agoOnly if stereo. You only need 2 tracks for mono. One for each side.dylan604 6y agoBut that's not how audio cassettes worked, otherwise they would not be compatible. Consumer cassette players/recorders were 4 tracks.rusk 6y agoYeah, duh. Two tracks for each side.