+<p>
+ The upper buttons are labelled by text in the video display just
+ below them. Pressing one of the buttons changes the function of the
+ knobs, and the parameters that will shown for each track/bus in the
+ display. As of Ardour 5.4, the possible parameters are:
+ <dl>
+ <dt>Volumes</dt>
+ <dd>The display shows a knob and text displaying
+ the current gain setting for the track, and a meter that
+ corresponds precisely to the meter shown in the Ardour GUI for
+ that track. Changing the meter type (e.g. from Peak to K12) in the
+ GUI will also change it in the Push 2 display. The physical knob
+ will alter track/bus gain.
+ </dd>
+ <dt>Pans</dt>
+ <dd>The display shows a knob indicating the pan direction/azimuth
+ for the corresponding track/bus. Turning the physical knob will
+ pan the track left and right. If the track/bus has no panner
+ (i.e. it has only a single output), no knob is shown and the
+ physical knob will do nothing. </dd>
+ <dt>Pan Widths</dt>
+ <dd><p>For tracks with 2 outputs, the display will show a knob
+ indicating the pan width setting for the corresponding
+ track/bus. The physical knob can be turned to adjust the
+ width.
+ </p>
+ <p>
+ Unlike many DAWs, Ardour's stereo panners have "width"
+ parameter that defaults to 100%. You cannot change the pan
+ direction/azimuth of a track with 100% width, but must first
+ reduce the width in order to pan it. Similarly, a track panned
+ anywhere other than dead center has limits on the maximum
+ width setting. If these concepts are not familiar to you,
+ please be aware than many DAWs use a "panner" that actually
+ implement "balance" and not "panning", hence the difference.
+ </p>
+ </dd>
+ <dt>A Sends</dt>
+ <dd>The display shows a knob indicating the gain level for the
+ first send in that track. If the track has no send, no knob will
+ be shown, and the physical knob for that track will do nothing.
+ </dd>
+ <dd>B Sends, C Sends, D Sends</dd>
+ <dt>Like "A Sends", but for the 2nd, 3rd and 4th sends of a
+ track/bus respectively.
+ </dt>
+ </dl>