+
+<p>
+ Normally, when you trim regions by dragging with the mouse, it affects
+ only the selected regions. Their lengths are directly affected by the
+ trim operation, but nothing else is. Sometimes though, you might like
+ to trim a region that directly adjoins another, and keep this relationship
+ the same — you are not trying to make one of the regions extend
+ over the other — you would like the junction to move in one
+ direction or the other as part of the trim. This requires trimming both
+ regions on either side of the junction, in opposite directions.
+ <dfn>Push/Pull trim</dfn>, activated by pressing shift key before
+ starting the drag, will do just that. Here's a few pictures to show the
+ difference in the results of a normal trim and push/pull trim. First,
+ the initial situation:
+</p>
+<img src="/images/a3_before_trim.png" alt="region arrangement before trim" />
+<p>
+ Here is what happens after we trim the right hand (selected) region by
+ dragging its starting position earlier:
+</p>
+<img src="/images/a3_after_trim.png" alt="region arrangement after a trim" />
+<p>
+ You can see that it now overlaps the earlier region and a crossfade has
+ been created between them.
+</p>
+<p>
+ Lets look now at what happens if we do the same trim, but <kbd
+ class="mouse mod3">Left</kbd>-dragging to turn it into a push-pull trim instead:
+</p>
+<img src="/images/a3_after_push_trim.png" alt="region arrangement after a push trim" />
+<p>
+ There is no overlap, and the end of the earlier region has been moved
+ along with the start of the later region, so that they still directly
+ adjoin each other.
+</p>
+
+