more tweaks to controlling note range

include/controlling-midi-range.html

@@ -9,7 +9,7 @@ <h2 id="controlling-note-range-defaults">Setting the defaults</h2>
 
 <p>
   The default note range shown in new MIDI tracks is controllable in
-  <kbd class="option">Edit &gt; Preferences &gt; MIDI</kbd>
+  <kbd class="menu">Edit &gt; Preferences &gt; MIDI</kbd>
 
 <figure>
 <img style="width:75%" src="/images/midi-note-range-prefs.png" alt="MIDI note range prefs">
@@ -20,11 +20,19 @@ <h2 id="controlling-note-range-defaults">Setting the defaults</h2>
 <h2 id="controlling-note-range-using-the-mouse">Using the scroomer</h2>
 
 <p>
-  The scroomer offers two kinds of control. You can "grab" it in the
-  middle and move it up or down - this adjusts the absolute note range
-  displayed up or down. Alternatively you can "grab" the top or bottom
-  handle of the scroomer, and move that up or down - this adjusts the
-  extent of the note range displayed.
+  The scroomer offers two kinds of control.
+</p>
+
+<h3>Shift the note range</h3>
+  <p>
+  "Grab" the in the middle and move it up or down - this adjusts the
+  absolute note range displayed up or down.
+  </p>
+<h3>Expand or shrink the note range</h3>
+<p>
+  "Grab" the top or bottom handle of the scroomer, and move that up or
+  down - this adjusts the extent of the note range displayed.
+</p>
 
 <figure>
 <img style="width:75%" src="/images/midi-scroomer.png" alt="MIDI scroomer">