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I have a growing collection of instrumental tunes that have been signed to (mostly non-exclusive) libraries. Most of these tunes were written for library use and, in most cases, these tracks won't ever be part of the music I perform live. Is there any reason not to release these tracks for digital download on all the major download sites? It's certainly doubtful that they would sell well, but costs are low, so it seems I have little to lose. Are there any use conflicts that I haven't thought of? Is there any chance that a placement could generate a few sales?Thanks in advance.

You don't have anything to lose provided your contract is non-exclusive. I've been doing this for years with my library music and it pulls in enough money to go out for dinner regularly (not that I do...)