i 'think' this is how you sort the audio devices (mics and speakers) from IMMDeviceEnumerator; to match the 'Sound' control panel GUI for Playback and Recording. found it through trial and error by plugging in a ton of USB sound cards into my notebook. first, you sort by the string system name {b3f8fa53-0004-438e-9003-51a46e139bfc},6. and if the system names are equal, then you sort by an additional guid {1da5d803-d492-4edd-8c23-e0c0ffee7f0e},8.

this should help devices that script automation of changing the default audio devices. e.g. Vista Audio Changer ... which seems to be dead?

amazingly, this dev notebook survived almost 3.5 years (Oct 2006). had been holding out for USB 3.0, but finally had to give up because this one's on its last legs : 1) DVD burner stopped working back in 2007. actually, i dont think i've had any notebook DVD burner last more than 1 year. 2) ethernet port doesn't work because it was destroyed by a lightning strike surge. 3) only 1 USB port still works. the other 3 have been worn down so much that they only recognize that a device is connected for a couple minutes. so i have a hub connected to the 1 working port. 4) power connection is bad. i had to dremel the lip off the plug so i could shove it deeper into the connection. and the plug has electrical tape around it to keep the connection tight. 5) lost the left-shift and left-ctrl keys on the keyboard. been having to use the 'righties' instead. 6) battery no longer holds a charge. if the bad power connection becomes loose, then it powers down within 5 minutes. anyway, it made it through a ton of code ... it'll be missed.