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I have an underscore version for a cue. Is it possible to include the underscore version without incurring another five dollar fee?

n/a

My understanding is an underscore is a cue without the melody. Sometimes the melody can interfere with the dialog of a scene, so removing the melody can make for a better fit in some instances; sometimes a melody is what's needed. Plus, if you have a melody it is very easy to remove in mixdown to create a second version. Being veratile can only be helpful.

From my understanding, an underscore is written to picture, while a cue is not. Notwithstanding, you are correct that editors will want a version of the cue without melody. The library will provide that, because they will ask you to provide that - potentially with other 'alt mixes' - when they contact you for the master. The library who auditions your cue will be able to imagine what the cue will sound like without the melody. The other way 'round, not so much. I think you're OK sending only the "full mix" version. That's what I've seen (heard) in the forwards blog.

Some members do send 'mix minus vocals' for an instrumental listing. I'm not sure how effective that is.