Specifications

What’s New in Pro Tools 9.050
Delay Compensation on
Auxiliary Inputs
Delay Compensation on Auxiliary Inputs can be
bypassed to let you monitor outside sources
(such as the audio tracks of a slaved video deck)
with minimal latency, while still reporting the
track’s delay.
To bypass an Auxiliary Input’s Delay
Compensation:
 Start-Control-click (Windows) or Command-
Control-click (Mac) the Track Compensation in-
dicator. The reported track delay will be zero,
and will appear grayed out.
Delay Compensation for MIDI
Pro Tools automatically maintains time align-
ment between recorded MIDI events and delay
compensated playback.
When Delay Compensation is enabled, a MIDI
event that is recorded to sound “in time” with
delay-compensated material actually is recorded
late by the length of total delay in effect. To
compensate, MIDI events are shifted back in
time by the total session delay following each
MIDI recording pass. MIDI playback after a re-
cord pass with Delay Compensation enabled ac-
counts for the low latency recording path and
maintains phase coherent time alignment with
MIDI playback.
Low-Latency Recording with
Virtual MIDI Instruments
When a MIDI or Instrument track that is routing
MIDI data to an instrument plug-in is record-en-
abled, Pro Tools automatically suspends Delay
Compensation through the main outputs of the
audio track, Auxiliary Input, or Instrument track
on which the instrument plug-in is inserted. This
allows for latency-free monitoring of the instru-
ment plug-in during recording.
MIDI and Audio Processing Plug-Ins
Some audio processing plug-ins (such as Bruno
and Reso) and many instrument plug-ins let you
process audio while allowing MIDI data to con-
trol processing parameters. When you record
enable a MIDI or Instrument track that is con-
trolling an audio processing plug-in, the track
the plug-in is inserted on will go into low-la-
tency mode, effectively making the processed
audio play early. The steps to prevent this and
keep audio time-aligned depend on the type of
track on which the plug-in resides.
To keep audio time-aligned when recording using a
MIDI controlled plug-in on an audio track:
 Start-Control-click (Windows) or Command-
Control-click (Mac) the Track Compensation in-
dicator for the audio track to apply Delay Com-
pensation.
When any Instrument or MIDI track is re-
cord enabled, all Instrument and Auxiliary
Input tracks with Instrument plug-in inserts
that are configured to receive MIDI in
Pro Tools are set to low-latency mode. In
this case, the Delay Compensation indica-
tors for those tracks display 0.
Delay Compensation for virtual MIDI in-
struments works only when all MIDI and
audio connections take place inside
Pro Tools. While Pro Tools does not
suspend Delay Compensation when you are
using ReWire to connect software synthesiz-
ers and samplers in other ReWire client ap-
plications (such as Reason), Pro Tools can-
not account for any latency within the
ReWire client itself.