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Then the answer is EWQLSO. Go for the Gold version. If you're going to start working with these kinds of professional tools, do yourself a favour and don't do it in a notation program like Finale. It's not designed for it. It's designed for making engravings. Using something like EWQLSO in Finale is essentially using it at less than half its potential power. Producing respectable audio renderings is the realm of the Digital Audio Workstation (or DAW) software packages like Cubase, Logic, Reaper, etc. Reaper is cross-platform, extremely powerful, versatile, and dirt cheap. It's a great one to learn. And there is a LOT of learning involved because sequencing and mixing and mastering are all distinct skills that have nothing to do with music writing skills. Don't be daunted, but be prepared for a steep learning curve. Nothing in this industry is plug-and-play.

Know the right person, and it will not matter how great or not so great your piece is.