One thing Jplay definitely does do in iTunes is utilize WASAPI and Kernel Streaming, which iTunes does not do, at least not in its most current version. The sound quality upgrade on my system is significant. Foobar: won't recognize AIFF files, cannot display album art...and J.River was hard to work with on my laptop, too many options, couldn't get sound out of it for some reason, but I was probably just impatient, and will try it out again someday. It's true that this is my work laptop and I am running programs that are memory intensive, like 3dsMAX and photoshop, while playing music, this is not a dedicated music laptop. Jplay makes a massive improvement in SQ in my situation.