Best way to play backing tracks

[carvinae185@gmail.com]

I have an audio interface with 4 inputs
Input 1 = Vocal
Input 2 = Guitar

Inputs 3 and 4 together form a stereo track.
There I can connect a phone (or whatever, of course).
The only thing left is to regulate the sound volume balance between track 1, 2 and 3/4 - so it fits to the need.
That is of course not always easy, but else ...

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What about the method of uploading a recording in jk.... I understand you can only upload 1 at a time But it supposedly gives you more control Over what the other musicians are hearing..... If they're hearing too much of your vocal mic and not enough of the backing track I understand this method gives them more control