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Bitperfect Test generator:
http://www.mediafire.com/?hay3x3uk4yf4a59
This is a Java applet that should run just by doubleclicking the downloaded JAR file. Once you do that, it will create 16b/44k1 and 24b/96k test WAV files in the same directory where it's located. Before testing, turn your system volume down to avoid some less than pleasurable experience. The M-DAC mutes the signal while in Bitperfect Test mode, but you might accidentally exit while still playing the white noise track which you should try to prevent.
Stop the playback, enter the Bitperfect Test from within menu, it should read Awaiting Trigger. Now play the test track from the beginning - almost immediately the display should change to Passing Test and should remain like that until the end of the track or any other interruption upon which the display will say Failed Test. It is normal to get Failed Test at the end of the test track or when you forcibly stop it, however you should not see it under any other circumstances.
If you're having problems, make sure the M-DAC is locked to the test file's samplerate already before commencing the test. The easiest way to do it is to just play the testfile for a second, then stop and only then go to the menu to enable Bitperfect Test. Always make sure you start testing from the very beginning of the test track and not from some arbitrary position.