Specifications
Pro Tools Reference Guide344
Groove Extrapolation
Beat Detective’s ability to extract tempo data
from a wide range of material is enhanced by its
powerful “groove extrapolation” logic. Groove
extrapolation automatically generates beat trig-
gers for inclusion in groove templates even if a
peak transient is not detected. For example, a
drum loop might not have a hit on beat 3, con-
sequently no peak transient is detected and no
beat trigger is generated. Beat Detective will ex-
trapolate from other beat triggers in the selec-
tion and create a trigger for beat 3 in the groove
template.
In addition, extrapolated triggers preserve the
feel of triggers generated from detected peak
transients. For example, if a bar of kick drum de-
tected three beat triggers, all of which were 20
ticks ahead of the beat, any extrapolated beat
triggers will also be mapped 20 ticks ahead of
the beat.
Separating Regions with
Beat Detective
Once beat triggers appear in your selection, they
can be used to define start and end points for
new regions that can be separated automati-
cally. The new regions can then be conformed
to the session’s existing tempo map, or to a
groove template (Pro Tools 6.x only).
If you want to clean up the timing for the selec-
tion, without affecting the tempo, make sure to
first calculate the tempo by generating Bar|Beat
Markers (see “Calculating Tempo with Beat De-
tective” on page 337).
To separate regions with Beat Detective:
1 In the Edit window, make an audio selection.
2 In the Beat Detective window, select Region
Separation mode.
3 Define or capture the selection as described in
“Defining a Beat Detective Selection” on
page 336.
4 Configure the Detection options so the selec-
tion’s peak transients are accurately detected
(see “Generating Beat Triggers” on page 338).
5 Click the Separate button.
Regions are separated based on the detected beat
triggers.
Trigger Pad
When separating regions, the Beat Detective
window displays an option called Trigger Pad.
Enter a value (0–50 ms) in this field to pad re-
gion start points—where the point of separation
is located in relation to the beat trigger (tran-
sient). This creates a space between the region
start point and the region sync point, thereby
ensuring that the attack portion of the material
remains intact.
Detection settings, Region Separation mode
Separated region with 20 ms Trigger Pad
Region start Sync point
(point of separation)
20
ms
(beat trigger)