M-AUDIO AP-012403 - Manual (Page 14)

microphone is not recommended. Instead, pass the microphone signal
through a microphone pre-amp (such as the M-Audio TAMPA™,
DMP3™, or Audio Buddy™), and then connect the pre-amp output
to the input of the Audiophile USB. Some additional cable and/or
cable adaptors may also be needed to ensure proper connectivity.
The Audiophile USB also has digital inputs and outputs in S/PDIF format.
These are available on RCA connectors, as stereo pairs.These jacks receive
or transmit a digital audio stream that is independent of the analog audio
streams. However, because of the bandwidth limits of USB there can be a
tradeoff between the number of inputs and outputs that are active and the
sampling rate and bit depth of the audio being processed. Also, you should
ONLY activate the S/PDIF Input if you are connecting an active digital audio
device to this input.This is detailed in the previous section,“The Audiophile
USB Control Panel.”
Also detailed in the previous section is the use of the S/PDIF Output for
sending encoded surround sound signals. Checking the “DD/DTS
Pass-Thru” box in the Audiophile USB Control Panel will allow you send
Dolby Digital, Dolby Surround, DTS, or any encoded surround sound signal
to the S/PDIF Output of the Audiophile USB.You can connect this output
to a home theater system, or any device that will decode this signal. Using
most DVD players, select the “S/PDIF” option in the DVD players audio
setup page, and your computer becomes a high-end home theater player
in conjunction with the Audiophile USB.
Audiophile USB with Your Music Software
Once the Audiophile USB hardware and software drivers are properly
installed, the Audiophile is ready for use with your music application
software. Some software applications may require you to highlight or
enable the Audiophile USB drivers within the program in order to use the
Audiophile, while others may have a utility that analyzes or profiles the
audio devices in your system and enables the drivers.Your software should
have an audio device driver setup page. If you have problems locating it,
consult your software’s documentation.
The Audiophile drivers include MME and WDM drivers for Windows, ASIO
drivers for both Windows and Mac, and Sound Manager drivers for Mac.
WDM drivers are a more modern driver architecture for Windows operating
systems Me, 2000, and XP, but only certain programs like Cakewalk’s “Sonar”
will take advantage of them. Other Windows programs will automatically
access and use the MME drivers.WDM drivers, similar to ASIO, will give you
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