Solid State Logic MX4 - Manual (Page 18)

Using the WDM/KS drivers (Windows Vista)
In Windows XP, multichannel audio cards are treated as surround devices.
A 16 input/output audio card would be seen as a 16 channel surround
device, a 64 channel audio card (such as the SSL Mixpander or SSL
MadiXtreme 64) would be seen as a 64 channel surround device.
Since this was not suitable for DAW software, the Soundscape driver
implemented stereo and/or eight channel ‘virtual devices’ on top of the
actual audio device.
In Vista, the way audio devices are handled has been changed several times
by Microsoft.
At the time of writing, only the first input and output virtual device is seen
by Windows Vista.
Despite this, DAW applications should still be able to see all the
WDM/KS devices, as shown here in Cakewalk Sonar:
Note however that most current audio applications can use the SSL
Soundscape ASIO-2 drivers (including Sonar).
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