Channel 9 broadcasts in color, but -as well as many other TV channels outside Buenos Aires- it has monophonic sound only.
This makes it possible to "fake" stereo in older films that were made with only monophonic sound.
The band's performance at the Coliseum was not professionally recorded, only captured as monophonic sound by fan Ken Koga.
The Gregorian chant was known for its very monophonic sound.
Although that recording was released on LP, it was in monophonic sound.
Another way to shift pitch and stretch time is to separate phase and time in a monophonic sound such as the ones of melody instruments.
In fact, poorly recorded or reproduced stereophonic sound can sound far worse than well done monophonic sound.
As it is now, stereo FM reaches only about half as far as the same signal can carry in monophonic sound.
However, it was ultimately released in monophonic sound, and was not issued in stereo until its release on DVD.
Recorded live in monophonic sound.