Instruction manual

SYNC HD Guide66
Using Fader Start
Fader Start allows faders in Pro Tools to trigger
external devices to play and stop.
SYNC peripherals have six GPI outputs in total:
two TTL-level and four relays. Together, this
combination of outputs makes it possible to pro-
vide Fader Start capability.
To implement Fader Start, Pro Tools maps the
first two visible auxiliary input channels in a ses-
sion 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 Auxil-
iary Input tracks, you will use the first and sec-
ond (top-most in the Edit window, left-most in
the Mix window).
2 When the first visible Auxiliary Input track in
a Pro Tools session is above –120 dB, GPI Relay
output 3 (Fader Start #1) will be enabled; other-
wise, it will be disabled.
Similarly, when the second visible Auxiliary In-
put track in a Pro Tools session is above –120 dB,
GPI Relay output #4 (Fader Start #2) will be en-
abled; otherwise, 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 94 for additional GPI infor-
mation.
Calibrating the SYNC
Peripheral Oscillator
SYNC peripherals provide a feature for calibrat-
ing the frequency of the onboard crystal oscilla-
tor. This allows the SYNC peripheral to be used
as an extremely accurate frequency reference
while in Internal/VSO mode.
With normal usage, the SYNC peripheral should
never require recalibrating. Each unit is factory
calibrated to within +/– 5 ppm (parts per mil-
lion).
You may want to recalibrate a SYNC peripheral
in the following situations:
• If greater than 5 ppm accuracy is required.
Utilization of Fader Start has specific wiring
requirements. See “GPI Relay Wiring for
Fader-Start” on page 94.
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.