DigiDesign Digidesign Pro Tools 8.0, Справочное руководство

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Pro Tools Reference Guide 670
Sample Rounding and Edit Operations
When audio material in Pro Tools is sample-
based, some amount of sample-rounding may
occur with some edits when the Main Time
Scale is set to Bars|Beats. This is most evident
when you need audio regions to fall cleanly on
the beat (as when looping) and notice that the
material is sometimes a tick or two off. With a
few simple precautions, this can be avoided.
To ensure that selections are precise aligned to
the grid for looping, copying, duplicating, or re-
peating, consider the following:
‹
If you use the Selector tool, enable Grid mode
and select the appropriate grid value (such as
sixteenth notes).
‹
For the greatest accuracy, type the selection
Start and End points in the Event Edit area.
‹
Do not select the material with any of the
Grabber tools (or by double-clicking with the Se-
lector tool).
Song Start Marker
The Song Start Marker defines the initial tempo
for Bar|Beat-based material. New sessions open
with a default tempo of 120 BPM.
When a new session is created, the Song Start
Marker has no associated meter event. A meter
event is added automatically at the Song Start if
you add another meter event anywhere else on
the Meter ruler.
The Song Start Marker can be moved, but it can-
not be deleted.
To move the Song Start Marker by dragging:
„
In the Tempo ruler with any Edit tool, drag
the Song Start Marker left or right.
If the Edit mode is set to Grid, the Song Start
Marker moves in increments of the current Grid
value.
To edit the initial tempo in the Song Start Marker:
1
In the Tempo ruler, double-click the Song Start
Marker.
2
In the Change Tempo dialog, enter a new BPM
value.
3
Click
OK
.
Song Start Marker
Song Start Marker
The position of the Song Start Marker can
also be changed in the Time Operations
window, see “Move Song Start” on
page 699.
Dragging the Song Start Marker
To move the Song Start Marker only, with-
out moving any tick-based data, press
Start+Shift (Windows) or Shift
(Mac) while dragging. When dragging the
Song Start Marker only, dragging is con-
strained to whole bar increments only.