- A MIDI track has the same basic
- <a href="@@audio-track-controls">controls as an audio track</a>,
- with the addition of two extra elements. The set of buttons below the main track
- controls the <dfn>MIDI channel</dfn>(s) that will be visible in the editor. A MIDI track's
- data may span any number of the 16 available MIDI channels, and sometimes it is
+ A MIDI track has the same basic controls as an <a href="@@audio-track-controls">audio track</a>,
+ with the addition of three extra elements:
+</p>
+<ol>
+ <li>Some meters for the track's outputs (MIDI in <span style="color:red;">red</span>,
+ Audio in <span style="color:green;">green</span>)</li>
+ <li>The <dfn>Scroomer</dfn>, a zoom and scroll controller for the midi notes range</li>
+ <li>When the track is tall enough, the External MIDI Device selection dropdown appears.</li>
+</ol>
+
+<h2>The Scroomer</h2>
+
+<p>
+ The Scroomer performs a couple of functions:
+</p>
+<ul>
+ <li>The scrollbar controls the range of pitches that are visible on the
+ track, as visualized by the piano keyboard. Dragging the body of the scrollbar up
+ and down displays higher or lower pitches.</li>
+ <li>Dragging the scrollbar handles zooms in and out and increases or decreases the
+ range of visible pitches.</li>
+ <li>Double clicking the scrollbar auto-adjusts the zooms to make the range of
+ visible pitches fit the actual content of the track.</li>
+ <li>Clicking on the piano plays the corresponding MIDI note for reference.</li>
+</ul>
+
+<h2>Channel and patch selection</h2>
+
+<h3>The Channel Selector</h3>
+
+<figure class="right">
+ <img class="mini" src="/images/midi_channel_control.png" alt="The MIDI channel control window">
+ <figcaption>
+ The MIDI channel control window
+ </figcaption>
+</figure>
+
+<p>
+ A MIDI track's data may span any number of the 16 available MIDI channels, and sometimes it is