DigiDesign Digidesign Pro Tools 8.0, Reference Manual

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Chapter 38: Elastic Audio 789
Meter (Tick-Based Only)
Elastic Audio analysis does not calculate meter
and assumes all files are in 4/4. If you work with
meters other than 4/4, use the Meter property to
correctly identify the source meter.
To change Meter of a region:
1
Open the Elastic Properties window for the re-
gion.
2
Click in the Meter nominator field and type
the correct number of beats per measure. For ex-
ample, if the region is in 3/4, type 3.
3
Click the Meter denominator field and type
the correct note value. For example, if the meter
is in 6/8, type 8.
TCE Factor
The TCE Factor property displays the percentage
of change applied to the source file. On tick-
based tracks, this property is display only and
cannot be edited. On sample-based tracks, you
can change the TCE Factor to apply TCE to the
region. The percentage of the TCE factor is al-
ways calculated in relation to the source file.
The TCE Factor value turns red when Elastic Au-
dio processes exceeds the valid range (see “Out
of Range Processing” on page 784).
Event Sensitivity
The Event Sensitivity property lets you filter
Event markers based on the analysis confidence
level. The confidence level for any detected
transient event is based, in part, on the clarity of
the transient. For example, if the file is a drum
loop, loud accented hits will be analyzed with a
higher degree of confidence than a soft, unac-
cented hit.
The Event Sensitivity acts like a threshold for
showing only the transient events that were de-
tected with a high degree of confidence. In
Warp or Analysis track views you will see the
number of Event markers decrease or increase as
you lower or raise the Event Sensitivity.
Lowering the event sensitivity can help reduce
the number of erroneously detected transients.
In turn, this can result in better sounding Elastic
Audio processing. Pro Tools preserves the de-
tected transients when applying TCE in order to
avoid flamming and granulation of the tran-
sients. Consequently, false transients are also
preserved and the resulting sound quality can be
less than desirable. If you are working with au-
dio material that does not have clearly defined
transients, you may want to lower the Event
Sensitivity in the Elastic Properties, or you may
want to even edit the Event markers in Analysis
view.
If lowering the Event Sensitivity results in filter-
ing out important Event markers, you can pro-
mote those Event markers in Analysis view (see
“Promoting Event Markers” on page 786).
For REX files, Pro Tools converts the slices
as Events with 100% confidence. Conse-
quently, setting the Event Sensitivity from
99% to 1% does not filter out any events
based on slices. However, if you set the
Event Sensitivity to 0%, all markers are fil-
tered out regardless.
When you change the Event Sensitivity
property, Pro Tools writes temporary fil-
tered Elastic Audio analysis files (.aan) to
the session’s Rendered Files folder. Any un-
used temporary filtered analysis files are
purged when you close the session.