Apple Logic Express 8 - Manual (Page 677)

Chapter 30 Advanced Tempo Operations 677
Choosing a Tempo Operation
The Operation menu provides several interesting tempo change editing functions,
which also alter the sync reference. The lock symbol allows certain parameters to be
fixed, preventing them from being changed.
Create Tempo Curve
The Create Tempo Curve operation lets you create numerous tempo change events
with just a few parameters, and provides a smooth overall change in tempo.
To create a tempo change in the Tempo Operations window:
1 Use the Position or Time fields to define the area that the tempo change should take
place across: the left field sets the curve start point and the right field, the curve end
point.
2 Enter the desired start and end tempos in the Tempo line.
3 Select the desired curve type.
Three kinds of tempo curves are available from the Curve Type menu. Each of these
offers a Curvature parameter (the field to the right of the Curve Type menu), which
determines if the tempo should speed up or slow down, dependent on whether
positive or negative curvature values are entered.
4 Adjust the Curvature parameter.
5 Alter the concentration of graphical tempo events with the Density parameter.
Values of 1/8 and finer should only be used if really necessary (with very slow or fast
tempo changes, for example). Don’t select a resolution higher than 1/8 or finer, just to
make the curve look smoother. This results in an unnecessary amount of processing,
and the creation of more tempo events than are needed.
∏
Tip: Watch the graphic display, as you change the values: The displayed tempo curve
(which is calculated from the tempo settings you’ve made) is shown in red.
Note: The “Continue with new Tempo” checkbox determines whether the original
tempo resumes after the tempo curve ends (unchecked), or the new tempo (the last
tempo change event in the curve) is maintained (checked).
6 Click Apply when you are done.