Creative 0404 owner manual Session Settings, System Settings, Using External Clock

4 - The PatchMix DSP Mixer

The Session

Session Settings

System Settings

Pressing the Session Settings button on the toolbar brings up the System Settings window shown below. Click the tabs to select System or I/O options.

The System Settings include the following choices:

•Internal/External Clock Selects between internal or external clock source as the master clock source for the system

• Sample Rate	Selects the sample rate when using internal clock.
	Your choices are: 44.1kHz, 48kHz, 88.2kHz, 96kHz,
	176.4kHz, 192kHz
• External Clock Source	Select from S/PDIF or the Word Clock (Sync card only) as
(ext. clock only)	an external sample clock source.

Using External Clock

Whenever you are connecting two or more devices using digital I/O such as S/PDIF, one of the digital devices MUST supply the master clock to the others. This master clock runs at the system sample rate and can be distributed using a dedicated cable (word clock) or embedded into a data stream such as S/PDIF. Common symptoms of unsynced digital audio include, random clicks or pops in the audio or failure of the digital stream to be recognized. Always check for the presence of the “LOCKED” indicator whenever you are using a digital interface.

If an External Clock is interrupted or switched after the Session has been created (except between 44.1k <-> 48k), the “LOCKED” indicator will extinguish and PatchMix will attempt to receive the external data. The two units are NOT sample locked however, and you should correct this condition to avoid intermittent clicks in the audio.

ENote: if set to “External” without an external clock present, PatchMix DSP defaults to the internal 48kHz clock rate.

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