M-AUDIO Pro Tools Recording Studio - Manual (Page 686)

Pro Tools Reference Guide 668
The following table lists the number of ticks for
each of the main note sizes:
Tick- and Sample-Based
Timebases
Pro Tools lets you set any track timebase to ei-
ther sample-based or tick-based.
Audio tracks in Pro Tools are sample-based by
default. This means that audio regions and
events are located at specific sample locations,
and they do not move from that location if the
tempo changes in the session—even though
their bar and beat locations do change.
MIDI and Instrument tracks in Pro Tools are
tick-based by default. This means that MIDI re-
gions and events are located at a specific bar and
beat locations, and they do not move from that
location if the tempo changes in the session—
even though its sample location does change.
Sample-Based Audio and MIDI
With a sample-based audio track, all audio re-
gions in the track have an absolute location on
the absolute Timeline (for example, on the Sam-
ples or Minutes:Seconds Timebase ruler). Audio
stays fixed to the sample time, regardless of any
tempo or meter changes occur in a session.
On sample-based MIDI and Instrument tracks,
all MIDI events in the track have an absolute lo-
cation on the absolute Timeline (for example,
on the Sample or Minutes:Seconds Timebase
ruler). MIDI events stay fixed to the sample
time, regardless of where tempo or meter
changes occur in a session.
Tick-Based Audio and MIDI
Tick-based audio is fixed to the relative time of
the Bars|Beats Timebase ruler, and moves rela-
tive to the sample Timeline when tempo and
meter changes occur. However, MIDI and Elastic
Audio events, and tick-based audio regions
(non–Elastic Audio) respond differently to
tempo changes in respect to duration. MIDI
note events and Elastic Audio regions change
their duration when tempo is adjusted, while
non–Elastic Audio audio regions do not. Tempo
changes affect only the location of the begin-
ning (or sync point) of each audio region in a
tick-based (non–Elastic Audio) audio track.
You can select whether a track is sample-based
or tick-based when it is created, or change time-
bases later.
Tick-Based Elastic Audio
Tick-based Elastic Audio tracks automatically
apply Real-Time (or Rendered) Elastic Audio
processing (TCE) when changing tempo. For
more information, see “Tempo Changes and
Tick-Based Elastic Audio Tracks” on page 674.
Note Value Normal Dotted Triplet
1/2 note 1920 2880 1280
1/4 note 960 1440 640
1/8 note 480 720 320
1/16 note 240 360 160
1/32 note 120 180 80
1/64 note 60 90 40
To have all new tracks default to tick-based,
enable the New Tracks Default to Tick
Timebase option in the Editing Preferences.