Applies a Playback Rate change to the given portion of sound under editing. A change to the playback rate will cause a change to both sound tempo and pitch, as if an LP disc was played at wrong RPM rate. The use of this method will speed up/down the sound playback, the sound duration will be altered and voices will result altered also; if you don't want to alter voices, use the Effects.TempoApply method.
During the execution of the editing session the CallbackEditPerc delegate is invoked in order to notify about the percentage of advancement.
For further details about callback delegates see the How to synchronize the container application with the API tutorial.
For further details about methods related to the use of special effects refer to the EffectsMan class.