Those 2 buttons control the behaviour of the playhead:
</p>
<ul>
<li><dfn>Follow Range</dfn> is a toggle that can be used to control whether or not making a range selection will move the playhead to the start of the range.</li>
<li><dfn>Auto Return</dfn> is a toggle switch too. When active, pressing the Stop button returns the playhead to its previous position, and when inactive, pressing Stop keeps the playhead at its current location. Activating Auto Return can be useful for hearing the same piece of audio before and after tweaking it, without having to set a loop range on it.</li>
</ul>
<h2id="status_indicators">The Status indicators</h2>
<tr><th>Solo</th><td>Blinks when one or more tracks are being soloed, see <ahref="@@muting-and-soloing">Muting and Soloing</a>. Clicking this button disables any active explicit and implicit solo on all tracks and busses. Clicking this button deactivates the solo on every track/bus.</td></tr>
<tr><th>Audition</th><td>Blinks when some audio is auditioned, e.g. by using the import dialog, or using the <kbdclass="menu">Audition</kbd> context menu in the <ahref="@@the-region-list">Regions List</a>. Clicking this button stops the auditioning.</td></tr>
<tr><th>Feedback</th><td>Blinks when Ardour detects a <dfn>feedback loop</dfn>, which happens when the output of an audio signal chain is plugged back to its input. This is probably not wanted and can be dangerous for the hardware and the listener.</td></tr>