In the Clock Source drop down menu, select the desired source:
•
To lock Symphony I/O to its Internal Clock Source, select Internal in Pro Tools' Clock
Source drop down menu. If a single Symphony I/O is detected as 2 192 I/Os, either
192 I/O drop down menu may be used.
•
To lock Symphony I/O to its Word Clock Input, select Word Clock (sample rate) in Pro
Tools' Clock Source drop down menu, where sample rate equals the actual rate of the
session. When the session is running at sample rates of 88.2-192kHz, a second word
clock entry at the base rate of 44.1-48kHz is found in the Clock Source menu - this is
not a valid selection.
•
To lock Symphony I/O to a Digital Input, please consult the charts below that indicate
valid Pro Tools software clock sources according to the I/O Module combination
installed in your Symphony I/O and the sample rate of the session. To avoid the
complicated correspondance between Pro Tools Software Clock selections and
Symphony I/O Hardware Clock Inputs, it's suggested to lock Symphony I/O to
Internal or Word Clock!
Pro Tools Clock Source
The following charts show, for each I/O Module combination at the three sample rate
ranges, valid Pro Tools Clock Source selections and the resulting Symphony I/O clock
source employed. For example, when 2 8 Analog + 8 Optical I/O Modules are installed,
and you wish to lock to S/PDIF Optical 3-4 (the first optical input on the top I/O
Module):
1. In Maestro, set Optical Format Card 2 to S/PDIF.
2. In Pro Tools' Hardware Setup > Main tab, set Digital Format to Optical (S/PDIF).
3. Select 192 I/O#2 > Optical (S/PDIF), as indicated in the 2 8 Analog + 8 Optical I/
O chart.
Please refer to the online version of this Users Guide for Pro Tools Clocking Charts.
http://support.apogeedigital.com/help/symphony-io/
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