<li><dfn>Solo</dfn>: Blinks when 1 or more track(s) are being soloed, see <ahref="/mixing/muting-and-soloing/">Muting and Soloing</a>. Clicking this button while active toggles the solo off on all tracks.</li>
<li><dfn>Audition</dfn>: Blinks when using the import dialog to audition material.</li>
<li><dfn>Feedback</dfn>: 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.</li>
</ul></li>
<li>A global Meter, showing the level of the Master Output, see <ahref="/ardours-interface/meters/">Metering in Ardour</a></li>
<li>the Mode Selector, allowing to switch between Editor and Mixer views, or edit the Preferences.</li>