So, my decision for the S40 has been made, now it’s up to the configuration, and I don’t see through the differences of the three audio systems (Performance/High Performance/Premium) quite yet. – The brochure says in the audio package “Performance”: “Can you expand a multi-function leather steering wheel and 6-fold CD changer.” My friend, however, claims that CD changer only works with high performance or premium, and so it’s also in the Easter Price List (April 2004). However, I don’t know if this has a technical background or a marketing measure. – I happen to notice at a test drive that the performance package obviously cannot be speed-dependent volume control (the whole menu item “Loudness settings” is missing). How is this with High Performance? Can someone clarify these two points? Is there any more detailed documentation of the differences in the audio packages than the two sides in the S40-Prospect? And does anyone know if there are any subsequent changes (see Upgrade Perf->Highium Perf->?