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4 - The PatchMix DSP Mixer<br />
The Session<br />
The System Settings include the following choices:<br />
• Internal/External Clock Selects between internal or external clock source as the<br />
master clock source for the system<br />
• Sample Rate Selects the sample rate when using internal clock.<br />
Your choices are: 44.1kHz, 48kHz, 96kHz.<br />
• External Clock Source<br />
(ext. clock only)<br />
Using External Clock<br />
Whenever you are connecting two or more devices using digital I/O such as S/PDIF, one<br />
of the digital devices MUST supply the master clock to the others. This master clock runs<br />
at the system sample rate (44.1, 48, or 96kHz) and can be distributed using a dedicated<br />
cable (word clock) or embedded into a data stream such as S/PDIF. Common symptoms<br />
of unsynced digital audio include, random clicks or pops in the audio or failure of the<br />
digital stream to be recognized.<br />
If an External Clock is interrupted or switched after the Session has been created (except<br />
between 44.1k 48k), a popup dialog box will appear with options to correct the<br />
situation.<br />
I/O Settings<br />
The <strong>0404</strong> PCI card is optimized for signal levels of -10dBV (consumer standard) for the<br />
analog inputs and outputs. -10dBV levels are compatible with most consumer audio<br />
gear.<br />
Setting correct input and output levels is important! You can measure the level of an<br />
input by inserting a meter into the first effect location in the strip. Adjust your external<br />
equipment outputs for the optimum signal level. See “To Set the Input Levels of a Strip”<br />
for details.<br />
E-MU <strong>0404</strong><br />
Optical Input<br />
Select<br />
Select from S/PDIF or the Word Clock (Sync card only) as an<br />
external sample clock source.<br />
S/PDIF<br />
Output<br />
Format Select<br />
(Sets S/PDIF-<br />
AES status bit,<br />
but doesn’t<br />
affect level.)<br />
The optical digital TOSLINK input and output on the Digital Breakout Cable can be<br />
used to transmit and receive stereo S/PDIF.<br />
E Note: if set to<br />
“External” without an<br />
external clock present,<br />
PatchMix DSP defaults to<br />
the internal 48kHz clock<br />
rate.<br />
14 <strong>Creative</strong> Professional