No not a smart idea. It is a pain in the butt and against the spirit of forums in general. Let's say I take the time and go to the effort of providing a solution to your question here, only to find out that someone else has already provided the same information in another thread you started in another forum. That would really annoy me. One question = one thread. Post in the most appropriate forum for the question you're asking.
Having said all that, you haven't given any indication of how you're playing these MP3 files so we cannot possibly know the best way to adjust volume. Are you using Windows Media Player, MCI or some other way?