Apple Logic Pro 9 - Manual (Page 465)

2 Open the Overlapping Recordings pop-up menu and choose “Merge with selected regions.”
3 Click the Replace button in the Transport bar.
Tip: You can also use the Merge/Replace combination in conjunction with the Autopunch
and Cycle functions.
Retrospective Recording of MIDI Regions
If you played a great solo while playback was running, but you weren’t in record
mode—don’t worry. Simply use the “Capture as Recording” key command (default
assignment: Control-*). All events you played (after the last playhead change) will be
added to the recorded MIDI region—just as if you had been in record mode.
Note: If you move the playhead before executing this command, the next incoming event
will delete all previously played events, and your solo will be lost forever.
465 Chapter 14 Recording in Logic Pro