INFO: Software Cheat Sheets
Final Cut Pro 6: Timeline Patch Panel Controls Keyboard Shortcuts
Cheat Sheet 20080229
Cheat Sheet 20080229
The grid on the left of the Timeline is the Patch Panel and it allows you to build up to 99 tracks each of audio and video.
To add a track:
Sequence - Insert Tracks
The Patch Panel determines which track is being edited.
(You can also drag the connections with your cursor if the Keyboard Shortcuts below aren't making you happy.)
Connected
Patches:

To connect a Patch (on tracks 1 through 9):
Video Patch connect: F6 + track # (F6 plus track number)
Audio Patch A1 connect: F7 + track # (F7 plus track number)
Audio Patch A2 connect: F8 + track # (F8 plus track number)
If a Patch is disconnected, your edit should not affect it.
Disconnected
Patches:

To disconnect a Patch (on tracks 1 through 9):
Video Patch disconnect: ⇧F6 + track # (Shift-F6 plus track number)
Audio Patch A1 disconnect: ⇧F7 + track # (Shift-F7 plus track number)
Audio Patch A2 disconnect: ⇧F8 + track # (Shift-F8 plus track number)