interesting that the ogg response is boosted at 10k. i wonder if these results correspond to your own subjective assessment? Personally i feel that ogg is an order of magnitude better than mp3 at all rates. Perhaps your comment "Ogg would be better than lame at variable bitrates, unless it had some issues with the high end" is drawing premature conclusions:-) i am of the opinion that over use of frequency response is responsible for some very bad design decisions in modern audio. Have you considered doing some time domain tests? To my ears the major problem with mp3 is smearing of transients. while i'm not sure of the purpose of trying to 'objectify' a format designed for the human ear, its interesting to see the results. Many thanks. cheers -- Tim Orford