We put a click
The ‘click’ refers to the sound produced by a metronome. (similar to Morse code clicks). The metronome is used in recordings to guide the musician in order to keep the beat. In this case, Moroder put a ‘click’ on a 24-track to keep the beat while playing a Moog Modular.
As he speaks, you can hear an example of a basic click over the track.
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