I tend to view "visualization" mostly as "on-screen memory" - it is a way to avoid the user having to *actually* remember the state of (potentially) thousands of different controls, by presenting them to him/her in a relatively fast-lookup sort of way. did i solo that? what was the gain level of that ? what processing am i doing with that signal? etc. etc. there is nothing inherent to the task of recording and editing music that requires a visual presentation, but doing without one when working with anything but the simplest possible setup requires the user to constantly remember a large amount of stuff - not always easy to do.
mixing consoles, besides actually doing signal processing, also serve this purpose even though they do not (generally) provide any visualization of waveform data or present a timeline.
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