> The newest driver simply does not work with OSX 10.8.2
It does work, but generates noise, correct? Otherwise you won't be able to hear or record the noise.
I'm running the HD300, with the latest firmware and the latest audio interface drivers, through OSX 1.8.2, and increasing the buffer fixed the noise issue for me. Unless the HD500 uses a different, obsolete set of drivers, which is unlikely.
I'll shut up now and let an actual HD500 user shed light on this