Apple Logic Pro 9 - Manual (Page 1034)

Creating Tempo Curves in the Tempo Operations Window
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 field 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 start and end tempos in the Tempo line.
3 Select a curve type.
Three kinds of tempo curves are available from the Curve Type pop-up menu. Each of
these offers a Curvature parameter (the field to the right of the Curve Type pop-up menu),
which determines if the tempo should speed up or slow down, depending 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.
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 (unselected), or the new tempo (the last tempo
change event in the curve) is maintained (selected).
6 Click Apply when you are done.
Creating Constant Tempo in the Tempo Operations Window
The Create Constant Tempo operation creates a constant tempo in any selected area.
The default setting assigns an average tempo for the selected project section (based on
existing tempo change events).
If you want to remove all tempo variations between two points, without changing the
SMPTE time for the rightmost position, click the Apply button.
Don’t forget the “Continue with new Tempo” checkbox, which retains the new tempo or
returns to the initial tempo.
1034 Chapter 33 Advanced Tempo Operations