> mute yourself

The homepage describes it has push-to-talk; is muting yourself distinct from not pushing?

Yes, muting is on the receiving side: when you mute a group (or global mute) you won't hear anyone, and they can all see that you've muted and aren't there.

The push-to-talk is on the sending side. So when you're not pushing, your mic is muted. And when you click the mute button, your speakers are muted.

Oh I see, muting a group rather than yourself.