Hi, I've just tried to hack my MZ-NH600 (I believe it's an european model because It was bought in spain and had the Owner's Manual in 3 languages, plus, it has Line In and DC Plug), but the value was already set to A0, so I thought I should move to 25, but I couldn't, the other values were A1...A9...B1...C1... and so on... I believe it has still the European lower volume since my R500 at 30/30 is louder than my NH600 at 30/30 (Same earphones, same song, even same battery)...