Specifications

Pro Tools Reference Guide172
To set the pre- and post-roll amounts by dragging
in the Ruler:
1 If you want the dragged flags to snap to the
current grid value, set the Edit mode to Grid.
2 Drag the Pre-Roll Flag to a location in the
Ruler.
3 Drag the Post-Roll Flag to a location in the
Ruler.
Recording from a Digital
Source
If you plan to use a DAT player, digital-output
CD recorder, or other digital input and output
device with your Pro Tools system, make sure it
supports the correct digital format. For example,
your interface’s AES/EBU inputs and outputs
should only be connected to another AES/EBU
device.
Pro Tools|HD Systems
The 192 I/O, 192 Digital I/O, and 96 I/O include
AES/EBU, S/PDIF, and ADAT digital options. Ad-
ditionally, the 192 I/O and 192 Digital I/O in-
clude TDIF digital I/O options. The 96i I/O in-
cludes only the S/PDIF digital option.
On a 192 I/O, 192 Digital I/O, or 96 I/O,
Pro Tools can receive digital audio from the fac-
tory-installed Optical (ADAT) I/O at any time (if
it is not set to S/PDIF). However, Pro Tools can
only receive digital audio from one of its enclo-
sure [Encl] digital sources—AES, S/PDIF or Opti-
cal (S/PDIF) at a time.
Enclosure digital sources come standard with
HD I/Os and are labelled on-screen as [Encl] ver-
sions, to differentiate them from digital inputs
and outputs available on the 192’s Digital I/O
card. For example, the AES/EBU inputs and out-
puts that come standard in the 192 I/O enclo-
sure are identified as AES/EBU [Encl].
The additional digital ports on the 192 I/O and
192 Digital I/O are TDIF, AES/EBU, and ADAT.
Pro Tools can only receive digital audio from
one of these ports at a time.
However, inputs on both the 192 I/O enclosure
I/O and Digital card can be used simultaneously.
For example, on a 192 I/O, it is possible to clock
off a source from one of the enclosure inputs
and have another digital input from the digital
ports doing a sample rate conversion, thus hav-
ing two digital sources.
Pro Tools|24 MIX Systems
On the 888|24 I/O, 24-bit ADAT Bridge I/O, and
the original ADAT Bridge I/O, both AES/EBU
and S/PDIF outputs are active at all times, so you
can actually send digital audio to two different
digital devices simultaneously at mix time.
However, Pro Tools can only receive digital au-
dio from one digital source (AES or S/PDIF) at a
time.
In addition, although the 888|24 I/O has four
stereo AES input pairs, only input pair 1–2 on
the master audio interface, (the first audio inter-
face connected to your main DSP card), can ac-
cept an external digital clock source.
Dragging a Pre-Roll Flag in Ruler
To set pre- and post-roll values to the same
amount, Alt-drag (Windows) or Option-
drag (Macintosh) either the Pre- or the Post-
Roll Flag in the Ruler. The deselected flag
will immediately reset to the same value,
and will adjust accordingly as you drag the
selected flag.