You can lock reels to constrain their scrubbing behaviour to a selected clip. If you lock a clip on two different reels, you scrub them in sync. This is helpful when you want to scrub different versions of a clip simultaneously.

To lock a reel to a selected clip:

1. Hold the cursor over the frame of the clip on a reel and press L.

   A light blue border appears around the selected clip, and the clip—if it was collapsed—expands to show all frames.

2. Scrub the reel.

   Only the selected clip is scrubbed.

3. To unlock a reel, hold the cursor anywhere over the reel that you want to unlock and press L.

To scrub clips on different reels in sync:

1. Expand the clip on an unlocked reel that you want to scrub.
2. Line up a reference frame of the clip on the locked reel over the Play button in the reel playback controls.
3. Press L to lock the reel to that clip.
4. Line up the corresponding reference frame of the expanded clip on another unlocked reel with the frame you chose in step 2.

   Although the clips scrub in sync, you can offset their alignment by positioning them relative to each other prior to locking the reels.

5. Hold the cursor over the corresponding reference frame and press L.

   A light blue border appears around the selected clip.

6. Scrub either reel.

   The selected clips scrub in sync.

7. Lock other reels to add clips to the set.
8. To unlock a reel, hold the cursor anywhere over the reel that you want to unlock and press L.

To navigate clips on locked reels:

1. Use the following reel controls.

   Do this:	To:
   Click	Go to the next end (to the left) of the clips in the locked set.
   Alt-click	Go to the next transition (to the left) of the clips in the locked set.
   Click	Play the locked set backward.
   Click	Play the locked set forward.
   Alt-click	Go to the next transition (to the right) of the clips in the locked set.
   Click	Go to the next end (to the right) of the clips in the locked set.
   Press left arrow	Frame step backward by the specified number of frames (10 by default). See Reels.
   Press right arrow	Frame step forward by the specified number of frames (10 by default). See Reels.