User's Manual

Configuring Pro Tools 22
Clock Source
You can set the Clock Source for Pro Tools | Carbon in the Audio window of AMS, which can be accessed from the Hardware
Setup dialog. The
Clock Source defaults to the internal clock. If other digital devices are connected to Pro Tools | Carbon that can
be set to follow the internal clock of Pro Tools | Carbon, you can leave Pro Tools | Carbon set to the default Internal option. How-
ever, if you need Pro Tools | Carbon to follow an external clock source, such as a connected synchronization peripheral that gen-
erates Word Clock or a digital device that sends clock over ADAT optical, you will need to set Pro Tools | Carbon to follow that
clock source.
To select the appropriate Clock Source for Pro Tools | Carbon:
1 Do one of the following:
• In macOS, launch AMS.
• In Pro Tools, choose
Setup > Hardware and click Audio MIDI Setup.
2 Choose Window > Show Audio Devices.
3 Select Pro Tools | Carbon: Reserved for Pro Tools in the Audio Device list.
4 From the Clock Source selector, select the clock source that Pro Tools | Carbon should follow:
• Internal (default)
• Word Clock
• ADAT 1
• ADAT 2
Each possible internal and external Clock Source is listed once for each AVB input stream in the current Pro Tools | Carbon AVB
configuration. There is no functional difference between the listed options for each individual internal or external Clock Source.
Ensure that
Internal is selected if you are not clocking to an external source. If you need to clock to an external source, ensure that
the proper cable connections are robust and that the external clock source is providing clock data at the appropriate sample rate,
then select the Clock Source that matches your system configuration.
Selecting the Clock Source for Pro Tools | Carbon in AMS
If Pro Tools | Carbon loses sync with the selected external clock, the selected external clock is not automatically recovered once
it becomes valid again. If EXT starts flashing on the front panel of Pro Tools | Carbon, first select the Internal clock source for
Pro Tools | Carbon in AMS, next fix the clocking error and ensure that the external clock signal is valid, then re-select the ap-
propriate external clock source in AMS and verify that EXT lights solid green.