+<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>
+
+<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>
+