Sometimes you may find that some episodes have silence audio ranges, in Mame Cast you could skip the silence by enable Automatically skip silence settings.

You can also view silence ranges when playing an episode which silences detected. The settings can be turn on/off in Preferences -> Playback -> Display silence ranges in seek slider:

display silence in slider

With this settings enabled, you could see some color dots in playback seek slider if playing episode has silence audio, hover the dots will show you the details:

silence in slider