Mute / unmute locally all the conference audio (Jitsi Meet API)

We have a business case where one trainer runs multiple trainings through Jitsi (via multiple browser windows / tabs). At a given time she focuses only one of the groups (e.g. other groups do some group exercises). She wants not to hear the rest of the groups talking and works just with the current group. Still she needs to attend all the rest of the conferences and switches between them when needed.

Is it possible to mute / unmute locally all the audio coming from a conference with Jitsi Meet API (iframe integration)?