Mix in other voices when exporting audio parts of a score.

Your idea

Today I found out that I can export parts as audio, and get those parts in separate files.
Perfect rehearsal tool for our choir, I thought.
However, it would be even better if it were possible to mix in the other instruments/voices, at a lower level of course.
Maybe this could be interesting for some instrumentalists too, I don't know.

Problem to be solved

As a singer, finding the correct pitch is much easier when all the other voices are also audible, at a lower level.

Prior art

I realize this can be done manually by exporting one voice at at time while changing the mix between each export, but that becomes quite tedious. If any other app has what I'm looking for I don't know.

Additional context

No response

Checklist

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests

The issue names no files, tests, or code entry points. Begin by tracing the existing workflow for exporting score parts as separate audio files, then determine how other voices and their relative levels would be selected. Done means a part export can include the other voices at a lower level while preserving separate-part export behavior.