Apple Final Cut Express HD: Getting Started - Manual (Page 84)

84 Chapter 5 Editing With Audio
m If no In point is set, the position of the playhead defines the In point, and recording
continues to the Out point.
m If no Out point is set, the end of the sequence is used, defined by the end of the last
clip in the Timeline.
If Final Cut Express HD doesn’t have enough available memory to record the duration
specified, a message appears when you click the Record button in the Voice Over tab,
prompting you to set a shorter recording duration.