[butisaidsudo]

Oh, that's an excellent point too! Bass boost and loudness buttons on stereos are meant to give you a way to make music sound the same at a lower volume, but most people just set it and forget it.

With fully digital players, I guess there's no reason to not have dynamic EQs that adjust along with the volume. I'd think you'd see this more often, but I guess even basic EQs aren't available most of the time, so it's just not a feature that most people would care about.