utter.dev/flutter/dart-core/Duration-class.html">Duration</a></span> <span class="parameter-name">duration</span></span></li>
</ol>)

      

    </section>
    
<section class="desc markdown">
  <p>Specify the callbacks frequency of the <a href="../../public_flutter_sound_player/FlutterSoundPlayer/onProgress.html">onProgress</a> stream.</p>
<hr>
<p>The default value is 0 (zero) which means that there is no callbacks.
If you really want to receive the events, do not forget to call this verb.</p>
<h2 id="exa