Out of curiousity I just tried changing the dwChannelMask returned by DataRangeIntersection() in one of my drivers to KSAUDIO_SPEAKER_DIRECTOUT and I still see the 24-bit modes in the playback properties under SP1.
I am wondering if this is because Vista is using the format information caches in the registry instead of the format reported by your driver.
I just installed my modified driver on a fresh install of Vista with SP1 and the 24-bit formats are still all visible, so that rules out caching in the registry.
Jeff
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