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This is a USB sound card similar to Creative MP3+, but this card is 24 bits.
Important: The driver must be installed from the CD that comes with the package.
Very important: The CMSS button 
must be turned off. If the CMSS green
light is on, the result will not be correct.
The input can be set to 24 bits, but the output does not work with 24 bits. The ‘Measurement->Sound Cards…’ dialog box should look as shown below.
Only the line input can be used if the correct system delay is to be measured. This is set as default in one of the setups that comes with WinMLS, 'Yes, with loopback, no end-check' is selected as shown in the figure below ('Yes, with loopback, with end-check' did not work).
In the bottom part of the figure above, please note that What U Hear shold not be selected.
If you do not want to measure the system delay, go to 'Measurement->System Delay' and in the upper list box select 'No, remove system delay'.
The frequency response is +- 3 dB in the frequency range 4 Hz-21 kHz.
If you want to do calibrated measurements, the external
hardware output control 
is no
problem since it is controlled by WinMLS. But if you are using the microphone
input, the microphone input control
is not controlled by the software and cannot be touched after a input
calibration.
Note: When something is connected to the line input, the mic input does not work.
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