Specifications

Pro Tools Reference Guide342
Bar|Beat Markers are generated, based on the
beat triggers, and appear in the Tempo Ruler.
Working with Sub-Beats
Tempo is derived from Bar|Beat Markers.
Groove, or feel, is derived from Sub-Beats—the
deviation of subdivisions of the beat from the
strict tempo grid determines the groove or feel.
To extract the groove from a selection, set the
Detection Resolution to Sub-Beats. This ensures
that the inner rhythms within each bar (if they
indeed exist) are represented when generating
Bar|Beat Markers. These Bar|Beat Markers can
then be used to quantize other audio regions or
MIDI tracks, thereby conforming to the Bar|Beat
Markers generated by Beat Detective.
DigiGroove Templates
Beat Detective allows the fine timing nuances of
a rhythmic performance to be extracted and
saved as a groove template, called a DigiGroove
template. DigiGrooves can be saved locally to
the Groove Clipboard, or saved to disk as Digi-
Grooves.
Groove templates can be used to transfer the feel
of a particular performance to:
• Selected audio regions using Groove Conform
(see “Groove Conform” on page 347).
• Selected MIDI data using Groove Quantize
(see “Groove Quantize” on page 385).
Groove templates are “quantization maps” de-
rived from real musical performances. The
rhythmic character of each performance is ana-
lyzed and stored as a groove template. Beat De-
tective analyzes an audio selection for transient
peaks according to a defined threshold and
maps the rhythmic relationships to a 960 parts
per quarter note (ppq) template.
When create DigiGroove templates, Beat Detec-
tive also analyzes the dynamics of a perfor-
mance. Accents and peak levels are incorporated
into the groove template as velocity data, which
can be applied to change the dynamics of MIDI
tracks. Beat Detective translates amplitude to
MIDI velocity according to a linear scale. For ex-
ample, a 0 dBFS signal equals a MIDI velocity of
127, a signal at –6 dBFS equals a MIDI velocity of
64, a signal at –12 dBFS equals a MIDI velocity of
32, and –48 dBFS equals a MIDI velocity of 1.
Capturing this information is very important to
preserving the feel of a performance, and can
add life to MIDI tracks that lack dynamics.
Bar|Beat Markers generated at Bar resolution
Bar|Beat Markers generated at Beat resolution
When quantizing regions or MIDI notes to
Bar|Beat Markers on sub-beats that repre-
sent a swing feel, make sure to use a
straight quantize value (with the Swing op-
tion for Quantize disabled).
Beat Detective does not capture duration
data.