Session Settings; System Settings; Using External Clock - E-Mu 404 Owner's Manual

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
• 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 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.
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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, 88.2kHz, 96kHz,
176.4kHz, 192kHz
Select from S/PDIF or the Word Clock (Sync card only) as
an external sample clock source.
E Note: if set to
"External" without an
external clock present,
PatchMix DSP defaults to
the internal 48kHz clock
rate.
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