Downloaded "Decibel"

Downloaded above program and when I ask same to add my entire iTunes library it only pulls a partial list. All songs are "check-marked" so I don't understand. Ideas.
Only used Decibel for a short while (trial period). Thought it sounded great but wanted the functionality of the itunes interface so settled on Amarra MINI.

I seem to remember that Decibel is a bare-bones, no-frills player which just operates in its own playlist mode. I would assume there are limits to how much you can actually have in the playlist, meaning no huge libraries.

Hope that helps - going strictly based on memory here!