+
+<ol>
+ <li>The level meters for the track's outputs show MIDI output in <span
+ style="color:red;">red</span>, on the left; Audio output in <span
+ style="color:green;">green</span>, on the right</li>
+ <li>The <dfn>Scroomer</dfn>, a combined scroll and zoom widget for
+ controlling MIDI notes display range, is unique to MIDI tracks</li>
+ <li>An External MIDI Device combobox can appear, for selecting <a
+ href="@@patch-change#midnam">MIDNAMs</a></li>
+ <li>An External Device Mode combobox can appear, for selecting an external
+ device's mode, in case no relevant External MIDI Device has been selected</li>
+</ol>
+
+<p class="note">
+ To show the full set of MIDI track controls, the <a
+ href="@@track-height">track height</a> must be increased beyond the default
+ height. MIDI tracks will show only a few of the control elements when there
+ is insufficient vertical space. As for <a href="@@audio-track-controls">Audio
+ tracks</a>, this can be done by either toggling the
+ track's full screen mode (<kbd class="menu">Track > Height > Fit
+ selection (Vertical)</kbd>, default : <kbd>F</kbd>, or by simply
+ double-clicking an empty space in the track header, to increase the track's
+ height.
+ <br>
+ Further, the External MIDI Device and
+ External Device Mode comboboxes will <strong>not</strong> appear if there is
+ a synth plugin on the track that comes with an associated <a
+ href="@@patch-change#midnam">MIDNAM</a>.
+</p>
+
+<h2>The Scroomer</h2>
+
+<p>
+ The Scroomer performs the following 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>
+ <li><kbd class="mouse mod3">left</kbd> clicking on a note adds the note to the
+ selection (for all regions on the track). See <a href="@@note-selection">Note
+ Selection</a>.</li>
+ <li><kbd class="mouse">middle</kbd> clicking a note clears the selection, selects
+ only the note.</li>
+</ul>
+
+<h2>Channel and Patch Selection</h2>
+
+<h3>The Channel Selector</h3>
+
+<figure class="right">
+<img src="/images/midi-chan-sel-dlg.png" alt="The MIDI channel control window">
+<figcaption class="center">The MIDI channel control window.</figcaption>
+</figure>
+
+<p>
+ A MIDI track's data may utilize any number of the 16 available <dfn>MIDI channels</dfn>, and it is useful to be able to filter out a subset of those or force the input or output to utilize only certain channels. The Channel Selector dialog allows for filtering or modification of both the input and output of any given MIDI track.
+</p>
+
+<p>
+ The Channel Selector dialog is activated by <kbd class="mouse">right</kbd>-clicking on a MIDI track's header and selecting <kbd class="menu">Channel Selector...</kbd> from the menu that appears. Filtering or modification of Inbound MIDI events for the given MIDI track is done by selecting among:
+</p>
+
+<ul>
+ <li><kbd class=menu>Record only selected channels</kbd></li>
+ <li><kbd class=menu>Force all channels to 1 channel</kbd></li>
+</ul>
+
+<p class="note">
+ Selecting <kbd class=menu>Record all channels</kbd> does no filtering of inbound MIDI events.
+</p>
+
+<p>
+ If simple filtering of incoming MIDI events is desired, <kbd class=menu>Record only selected channels</kbd> should be selected. A 1-by-16 grid of squares with numbers in them will become sensitive to mouse clicks, and the desired channels to be allowed through the filter can then be selected by clicking on them. Channels that are allowed to pass through will be highlighted in green.
+</p>
+
+<p>
+ <kbd class=menu>Force all channels to 1 channel</kbd> will rewrite the channel number of all incoming events of the selected MIDI track to whichever channel is highlighted in the 1-by-16 grid of squares. When this option is chosen, one and only one channel can be selected.
+</p>
+
+<p>
+ Filtering or modification of outbound MIDI events is done by selecting among:
+</p>
+
+<ul>
+ <li><kbd class=menu>Play only selected channels</kbd></li>
+ <li><kbd class=menu>Use a single fixed channel for all playback</kbd></li>
+</ul>
+
+<p class="note">
+ Selecting <kbd class=menu>Playback all channels</kbd> does no filtering of outbound MIDI events.
+</p>
+