Thanks for the drum recommendation, I will have to give those a look! I might also be getting something with ComposerCloud that I haven't checked out yet...
And the weirder thing is, that's exactly what I did with each track! I faded the master volume down to zero... I think it's just something to do with how Studio One does bounces based on markers in the program, even though I thought I had adjusted everything for the final mixdown... but you're right, it's nothing to stress about!