\subsubsection*{But, I want to use only the first set of audio tracks\dots}%
\label{ssub:but_use_only_first_audio}
-There are many cases where you may want to compose using media from several different tracks while using the the same audio tracks as associated from a specific viewer. Since mixer source tracks can be updated any time by using a mixer toggle \index{mixers!toggle}, this makes it possible to do this.
+There are many cases where you may want to compose using media from several different tracks while using the the same audio tracks as associated from a specific viewer. Since mixer source tracks can be updated any time by using a mixer toggle\index{mixers!toggle}, this makes it possible to do this.
Procedure to update the mixer audio source track list: