Chapter 2: Hardware Overview and Stand-Alone Operation 13
4 Repeat these steps for additional connections.
Using External Devices
PRE can make dedicated connections to external
analog devices (such as compressors and equaliz-
ers) before committing the signal to disk in
Pro Tools. You can send and return signals to these
devices, using PRE’s back panel Send and Return
jacks.
To connect an external analog device to your
system:
1 Connect the Send jack of one PRE channel to an
input of the external signal processor.
2 Connect the output of the external signal pro-
cessor to the Return jack of the same PRE
channel.
3 Press the Channel Select switch for the
Send/Return channel you will be using.
4 Press Insert.
Repeat these steps for additional connections.
Calibrating Pro Tools | PRE
and Other Devices
Before you use PRE, you may want to calibrate its
output level (as well as the input and output levels
of other devices) to the level of your mixing con-
sole.
The output trims are factory-calibrated so that the
clip point of the PRE output amplifier matches the
factory-set clip point of HD I/O and 192 I/O ana-
log input. The PRE’s output level is –6 dBu below
its maximum output of +28 dBu (+22 dBu). If you
do not intend to use an HD I/O or 192 I/O, you
should turn the trims all the way up (clockwise) to
allow for maximum signal output (+28 dBu) and
maximum performance.
Adjusting Channel Controls
Most PRE parameters can be changed with front
panel channel control switches; for a description of
each switch, see “Pro Tools | PRE Front Panel” on
page 5. Input Gain is changed with the Gain/Param
control (see “Adjusting Input Gain” on page 14).
PRE channel controls can be applied to one or
more channels at a time.
To select one channel:
Press the Select switch of the desired channel.
Selecting one channel deselects the previously
selected channel or channels.
To select multiple channels:
Hold Shift and press the Select switch of any
channels you want to adjust.
When more than one channel is selected, metering,
control states, and Gain/Param settings
reflect the activity of the leftmost channel of the
group.
Adjustments made to any selected channel are
made to all selected channels. See “Mixed State
Operating Mode While Editing Multiple Chan-
nels” on page 14.
If using line inputs with balanced line level
devices, be sure to use balanced to balanced
cables to maximize performance.
Both the Send and Return jacks are balanced
1/4-inch jacks, with Tip wired hot (or “+”),
Ring cold (“–”), and Sleeve ground. Insert
send levels are post output trim.
To quickly select all channels, drag your
finger across all the Select switches.
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