Note: This issue is resolved in Soundtrack Pro 1.0.3. This update is recommended for all Soundtrack Pro customers. Use Software Update or download updates here.
When you add automation envelopes to a multitrack Soundtrack Pro project, the automation may play back at a later time than the audio (it's delayed).
This issue occurs if your Soundtrack Pro project is set to a higher sample rate than what your audio hardware can handle. To avoid this issue, always make sure to set your project to a sample rate that your audio hardware supports (choose Soundtrack Pro > Preferences > Project to set the sample rate).