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The default Latency setting is “Medium.” This setting should serve your purposes, but you can experiment with lower settings if you wish. 
If you experience stuttering or crackling in your audio playback, try using a higher latency setting.
Fast Track USB and Windows Media DriversWDM/MME
Fast Track USB’s Windows drivers support Windows’ native  WDM/MME protocol, allowing  you to use Fast  Track USB as your  Windows 
default audio device. If Fast Track USB is the only audio device installed on your computer, Windows will select it automatically. If you have 
other audio devices installed, you may need to select it as your default device:
1.  Click the Start menu, then choose Settings/Control Panel.
2.  Open the audio properties panel. In Windows XP it is labeled “Sounds and Audio Devices.”
3.   Under Playback and Record, select Fast Track USB from the drop down list. Click “Apply,” then click “Okay” to close the Control Panel.
ASIO
Fast Track USB also supports  Steinberg’s ASIO protocol  under Windows XP, used  in applications  such as Cubase,  Reason, Live,  Logic 
and other programs.  Fast Track USB’s  ASIO drivers  are installed  from the  M-Audio Fast  Track USB driver  CD-ROM. If  you have  other 
audio devices installed in your computer, you may need to select Fast Track USB as the ASIO device in your audio software.  Refer to the 
instructions in your audio software for details.
Fast Track USB and Macintosh AudioMac OS X
The Fast Track USB supports Mac OS X Core Audio protocol. To select the Fast Track USB as your system’s audio device:
1.  Under the Apple menu, select System Preferences / Sound.
2.  Select Fast Track USB under input and output tabs to choose the Fast Track USB as your default audio device.
When recording with standard DAW applications, the Fast Track USB microphone input is displayed as INPUT 1 and the Guitar/Line input 
is displayed as INPUT 2.