Specifications

Chapter 21: Audio Recording 475
stalled in HD I/O or 192 I/O. For example, the
AES/EBU inputs and outputs that come standard
in the 192 I/O enclosure are identified as
AES/EBU [Encl].
The additional digital ports on the HD I/O, 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 HD I/O and 192 I/O
enclosure I/O and Digital card can be used simul-
taneously. For example, on an HD I/O, it is possi-
ble to clock off a source from one of the enclosure
inputs and have another digital input from the dig-
ital ports doing a sample rate conversion, thus hav-
ing two digital sources.
Pro Tools Audio Interface Digital
Options
003, 003 Rack, 003 Rack+, Digi 002, and
Digi 002 Rack include S/PDIF and ADAT
digital I/O.
Eleven Rack includes S/PDIF and AES/EBU
digital I/O.
Mbox (3rd generation), Mbox 2, Mbox Pro, and
Mbox Pro 2 include only the S/PDIF digital option.
All digital outputs are active at all times, so you
can actually send digital audio to different digital
devices simultaneously at mix time.
Recording from Digital Sources
To record from a digital source with Pro Tools:
1 Connect the digital output of the recording
source to the appropriate digital input of your
audio hardware.
2 If you want to start a new session with a differ-
ent sample rate, do the following:
• Choose
File > New Session
• Select the sample rate.
• Configure the rest of the New Session dialog
accordingly.
• Click
Save.
3 Specify the format (digital) of the inputs of the
audio interface to which the digital recording
source is connected:
• Choose
Setup > Hardware.
• Choose the audio interface.
• Select the digital format for the appropriate
channel pair (such as AES/EBU or S/PDIF).
4 For Pro Tools HD, select the appropriate Clock
Source
in the Session Setup window or Hard-
ware Setup dialog.
5 Create a new stereo audio track.
6 Assign the Input Path selector for the track to
the appropriate input. Since this is a digital
transfer, you do not need to worry about input
levels.
Some Pro Tools audio interfaces only have
two channels that can be set for analog or
digital. For example, Mbox (3rd generation)
has S/PDIF L–R (Stereo) digital inputs and In
1–2 analog inputs. Mbox (3rd generation)
can record through analog and digital inputs
simultaneously.