Using External Clock; I/O Settings - E-Mu 404 Owner's Manual

4 - The PatchMix DSP Mixer
The Session
The System Settings include the following choices:
• Internal/External Clock
• Sample Rate
• External Clock Source
(ext. clock only)

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 (44.1, 48, or 96kHz) 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.
If an External Clock is interrupted or switched after the Session has been created (except
between 44.1k <-> 48k), a popup dialog box will appear with options to correct the
situation.

I/O Settings

The 0404 PCI card is optimized for signal levels of -10dBV (consumer standard) for the
analog inputs and outputs. -10dBV levels are compatible with most consumer audio
gear.
Setting correct input and output levels is important! You can measure the level of an
input by inserting a meter into the first effect location in the strip. Adjust your external
equipment outputs for the optimum signal level. See
for details.
E-MU 0404
Optical Input
Select
The optical digital TOSLINK input and output on the Digital Breakout Cable can be
used to transmit and receive stereo S/PDIF.
14
Selects between internal or external clock source as the
master clock source for the system
Selects the sample rate when using internal clock.
Your choices are: 44.1kHz, 48kHz, 96kHz.
Select from S/PDIF or the Word Clock (Sync card only) as an
external sample clock source.
"To Set the Input Levels of a Strip"
Note: if set to
E
"External" without an
external clock present,
PatchMix DSP defaults to
the internal 48kHz clock
rate.
S/PDIF
Output
Format Select
(Sets S/PDIF-
AES status bit,
but doesn't
affect level.)
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