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4 - The PatchMix DSP Mixer
The Session
16
Creative Professional
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:
E
 Note: if set to 
“External” without an 
external clock present, 
PatchMix DSP defaults to 
the internal 48kHz clock 
rate.
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.
• 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 
    (ext. clock only)
Select from S/PDIF or the Word Clock (Sync card only) as 
an external sample clock source.