Hi, I am trying to sort out the way in which QuickTime handles sound. I can't find actual numerical/OSType definitions for these in the QTAPI6 docs or the QT components docs or on the website. Anybody got any ideas ? Best Regards Ian The following constants have been added to the list of selectors that can be passed to SCGetInfo and SCSetInfo . These selectors are only supported by the standard sound dialog component, not the standard image-compression dialog component. scSoundSampleRateType A pointer to an UnsignedFixed value that represents the current sample rate. scSoundSampleSizeType A pointer to a short integer that represents the current sample size. This value is either 8 or 16. scSoundChannelCountType A pointer to a short integer that represents the current number of channels. This value is either 1 or 2. scSoundCompressionType A pointer to a value of type OSType that represents the current compression type. This value is either kRawCodecType or one of the available sound compression formats. scCompressionListType A pointer to a handle containing an array of values of type OSType that indicate the sound compression formats that may be presented to the user. Pass nil to SCSetInfo to reset the list to all available sound compression formats.