What's modal exchange?

2021-03-30T04:29:55Z

As in music theory, I think it's borrowing chords from the parallel key of the section you're writing in.

Mamianka2021-03-26T20:53:51Z

This is in the classical music section.  Do you mean the use of modes within compositions?  Or are you referring to modal exchange in computer terms? Let us know, or move this, so you can get help.

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Yes, using chords from an allied key or mode is sometimes called that.  A lot of terms are situational, and then get mis-used, too.