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Sample Rate mismatch/unlocked w/ external digital/word clock sync (Vista)
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Q: I am trying to record from the digital input of my M-Audio FireWire device in Windows Vista, but I am getting a sample rate mismatch or unlocked message.

A: In Windows Vista, it is not currently possible for Vista to automatically detect the incoming sample rate to your M-Audio device and communicate that with the audio driver.  It is necessary to manually set the sample rate in the FireWire control panel to match that of your external digital device before launching your recording application.

Before proceeding, quit all applications and ensure that your external digital device is connected to the digital input of your M-Audio FireWire device.  If you are using external BNC word clock sync (FireWire 1814, Project Mix I/O, & ProFire Lightbridge only), connect a 75-ohm BNC Word Clock cable from the word clock output of your external digital device to the BNC Word Clock input of your M-Audio device.

1. Launch The M-Audio FireWire Control Panel.  This can be accessed from the Windows Control Panel.

2. Select the Hardware Tab.

3. In the sample settings section, use the up/down arrows to set the sample rate to match that of your external digital device.



If you see mismatch in the sync source section, confirm that the sample rate set in the FireWire Control Panel does in fact match that of your external digital device.



If you see unlocked ! in the sync source section, make sure that your external digital device is set to Internal Sync, or that it is designed as the Master Word Clock Device. 



FireWire 1814, Project Mix I/O, and ProFire Lightbridge users should confirm their settings for digital port selection.



Also confirm that you have selected the appropriate sync source.



With the appropriate sync source selected, proper digital port selection (if applicable), and the sample rate set to match that of your external digital device, locked should appear in the sync source section and you can now launch your recording application and begin recording from the digital input of your M-Audio FireWire device!

Note: The order in which you make your connections and settings does not matter so long as you see locked in the sync source section of the FIreWire Control Panel before launching your recording software.