If you haven't already read the introduction to the previous Opening up the sequence using Splice with Sync Locks enabled recipe, then you may find it helpful as it includes an overview of Sync Locks as well.
This recipe presents a situation where Sync Locks will save us some steps because we won't have to reconfigure the Track Selectors from whatever configuration they happen to be set at a particular moment.
The situation in this example is the following:
Loaded in the Timeline Window is a sequence that contains one video track and four audio tracks.
The last edit was Lifting out some music on track A4, so that happens to be the only track that's enabled at the moment. Refer to the following screenshot: