This depends on the way that VoiceBoxer is configured by the organizer and which of the roles you are assigned to.

For example, VoiceBoxer Podium single-video only has one active speaker who can be seen/heard at a time. In this way, interpreters will only receive one audio feed and will be able to perform at the best of their abilities!

Only when the moderator gives you the floor, you will be heard and seen by the people participating in the event.