+<p class="note">
+ Selecting <kbd class=menu>Playback all channels</kbd> does no filtering of outbound MIDI events.
+</p>
+
+<p>
+ Simple filtering of outgoing MIDI events is done similarly to simple filtering of incoming MIDI events, and is done by selecting <kbd class=menu>Play only selected channels</kbd>. Also similarly to the incoming case, <kbd class=menu>Use a single fixed channel for all playback</kbd> will rewrite the channel number of all outgoing events of the selected MIDI track to whichever channel is selected.
+</p>
+
+<p>
+ When either <kbd class=menu>Record only selected channels</kbd> or <kbd class=menu>Playback only selected channels</kbd> is selected, a group of three buttons, each appearing below their respective 1-by-16 grids, will become sensitive to mouse clicks. They perform the following functions:
+</p>
+
+<table>
+<tr>
+ <th>All</th>
+ <td>Selects all the channels in the 1-by-16 grid above it; all the squares become lit with green</td>
+</tr>
+<tr>
+ <th>None</th>
+ <td>Deselects all the channels in the 1-by-16 grid above it; all the squares become unlit</td>
+</tr>
+<tr>
+ <th>Invert</th>
+ <td>Any channel in the 1-by-16 grid that is lit green becomes unlit, and any unlit channel becomes lit with green</td>
+</tr>
+</table>
+