Specifications

SYNC I/O Guide62
USD Compatibility Mode
This setting lets you turn USD emulation on and
off, to support older Pro Tools systems and
other audio systems.
Using Fader Start
SYNC I/O provides six GPI outputs in total, two
TTL-level and four relays. Together, this combi-
nation of outputs makes it possible for
SYNC I/O to provide Fader Start capability.
Fader Start allows faders in Pro Tools to trigger
external devices to play and stop.
To implement Fader Start, Pro Tools maps the
first two visible auxiliary input channels in a
session to GPI Relay outputs 0 and 1 (first being
left-to-right in the Mix window, top-to-bottom
in the Edit window).
Example Fader Start Application
In a typical scenario, the Fader Start feature con-
trols playback of a CD player. The CD player
outputs are routed into a Pro Tools stereo Aux
Input. As the Aux channel fader is moved above
–120 dB, playback of the CD player is automati-
cally triggered. Likewise, as the fader is moved
below –120 dB, playback is automatically
stopped.
To configure Pro Tools tracks for Fader Start Play
and Stop:
1 Use the New Track dialog to create two new
auxiliary input tracks. If you already have aux
tracks, you will use the first and second (top-
most in the Edit window, left-most in the Mix
window).
2 When the first visible aux input in a Pro Tools
session is above –120 dB, GPI Relay output 3
(Fader Start #1) will be enabled; otherwise, it will
be disabled.
Similarly, when the second visible aux input in
a Pro Tools session is above –120 dB, GPI Relay
output #4 (Fader Start #2) will be enabled; oth-
erwise, it will be disabled.
If you rearrange channel strips in the Pro Tools
Mix or Edit windows, the two GPI outputs will
update dynamically to reflect the current state.
The Fader Start channel must be in a Show Track
state (not hidden). See “GPI Relay Wiring for
Fader-Start” on page 90 for additional GPI infor-
mation.
Utilization of Fader Start has specific wir-
ing requirements. See “GPI Relay Wiring for
Fader-Start” on page 90.
To rearrange tracks, drag the Track Name
left or right in the Mix window, or up or
down in the Edit window. See the
Pro Tools
Reference Guide
for more information.