Pro Tools Reference Guide542
Realign Session
Beat Detective’s Realign Session function lets you
generate Bar|Beat markers without tick-based
material shifting. This is useful if you want to
extrapolate Bar|Beat markers from tick-based
material to align the tempo map and Bar|Beat
grid to the tick-based material.
Generating Bar|Beat markers in sessions with
tick-based material, such as MIDI tracks and
tick-based audio tracks, can cause the tick-based
material to shift in absolute time. This can be
useful if you want to align the tick-based mate-
rial to Bar|Beat markers generated from sample-
based material.
When you generate Bar|Beat Markers in a ses-
sion that contains tick-based audio or MIDI,
Beat Detective gives you the option to preserve
the position of the session’s tick-based material,
or to allow the material to shift.
To generate Bar|Beat Markers with Beat
Detective in a session with tick-based tracks:
1 In the Edit window, make an audio or MIDI se-
lection.
2 In the Beat Detective window, select Bar|Beat
Marker Generation mode.
3 Define or capture the selection as described
in“Defining a Beat Detective Selection” on
page 538.
4 Set the Detection resolution to Bars or Beats.
5 Click the Generate button.
6 Do one of the following:
• In the Realign Session dialog, choose Pre-
serve Tick Position if you wish to let the
tick-based material shift in absolute time.
This option maintains prior Beat Detective
functionality.
– or –
• Choose Preserve Sample Position if you
wish to have the tick-based material main-
tain its absolute position. This option can
be useful when adding a meter and tempo
map to a freely played performance.
7 Click OK.
Tips for Getting Useful Beat Triggers
Use the following tips to verify beat triggers:
◆ To focus on a particular area in the selection,
unlink the Timeline and Edit Selections and set
the playback range by clicking or dragging in
any Timebase ruler.
◆ Check the thickness of the beat triggers to see
if they align properly with the audio material.
Thick triggers fall on barlines, medium triggers
fall on beats, and thin triggers fall on sub-beats.
◆ Select the option for Show Trigger Time and
see if the (assumed) metric locations of the trig-
gers align with the material. A false trigger
should be moved or deleted because it can cause
subsequent triggers to appear in the wrong loca-
tions (see “Editing Beat Triggers” on page 543).
You can also switch tick-based material,
such as a MIDI performance, to be sample-
based and then manually insert Bar|Beat
markers.
Realign Session dialog
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