livetrax/manual/xml/invert_polarity.xml

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<section id="sn-invert-polarity">
  <title>Inverting the Polarity of a Track</title>
  <para>
    The polarity of a track can be inverted in the Mixer Window by clicking
    on the track name button of a Mixer Strip and choosing
    <menuchoice><guimenu>Invert Polarity</guimenu></menuchoice>.
  </para>
  <mediaobject>
    <imageobject>
      <imagedata fileref="images/invert_polarity.png"/>
    </imageobject>
  </mediaobject>
  <para>
    When the polarity of a track is inverted a <literal>Ø</literal> will
    appear before the track name in the Mixer Strip.
  </para>
  <tip>
    <para>
      This could be used to correct the polarity of an input signal due to
      incorrect wiring or to prevent two signals that are out of phase with
      respect to each other causing cancellation when mixing.
    </para>
  </tip>
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