Yeah... sorry I took so long to reply but I can definitely see what's going on with this. Basically my computer's audio settings are a little messed up to where some of my songs sound completely perfect while I'm editing them, but it falls out of balance because of the messed up settings later on. My recent song (which I'll give a YouTube link to) has a REALLY bad case of this where you pretty much can't hear the main melody. For that reason I made another song with the same thing... it's basically a redo of the fail I had on the song before it. xD
Here's the link to another example of a volume fail: https://www.youtube.com/watch?v=qEBOLiVHseI
In that song, it sounds good until it gets into the major sections with the melodies and all that. The intro is fine, but then it just gets sloppy. My belief on this is that with only a couple instruments, the major volume issue I've been running into is simply dimmed at that point because there's less instruments present at that point in the tune to imbalance it, even though for some reason it's still that way.
Basically, the big audio issue I've been having is probably related to none other than the Beats Audio settings on my laptop. I'll literally listen to something on any other device and think it sounds bad, but with Beats Audio, it's good... it makes no sense. Basically, I've been going through the actual settings (which I believe to be the source of the volume imbalance issue) and trying to play with it some.
I guess it's time to do more playing. xD