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If I recall correctly I thought when real tracks first came out it used midi to trigger sampled instruments, therefore having the best of both worlds.

No. Realtracks have never used midi to trigger sampled sounds.

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... unless they are using pre-recorded chord progressions and have every possible progression recorded.


That's correct. Realtracks are live performances recorded as audio. An artist performs many chord progressions in different keys and with different riffs and rhythms. PG Music then map these chords and progressions. When Realtracks are assembled into a backing, sections of the original recording are are copied, transposed (if needed) and pasted together to generate the backing.

I'm not sure that "every possible chord progression" is recorded but enough are so that it's possible to get most of what anyone wants.

Regards,
Noel


MY SONGS...
Audiophile BIAB 2025