Here is an explanation of the processes I went through to record "While My Guitar Gently Weeps", using 32 tracks of audio onto GarageBand on an iPhone SE, with a little preamble about digital audio. Bear in mind that the SE is currently the "bottom of the range" Apple product!
Original tune here: https://www.youtube.com/watch?v=C7iXExAqDJc
The demo of the GarageBand mix and looking at audio tracks starts at:
5:22
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