Took delivery of 2004 MCS with H/K, read the manual, went to the "LIN" input and no speed adjustment. The manual clearly indicates that the speed option is there, but it only shows the audio adjustment for the Navigation (which I don't have). I asked my dealer, and they said they'd heard that from others with H/K but didn't know whether it was user adjustable or not. Reading further thru the posts I see that it isn't adjustable by the driver. I just wish the manual stated it clearly. I wouldn't have been scratching my head. :apple: