Consecutive interpretation in 2 different languages

Hello, i have a problem: we need to make a webinar where part of the audience understands portugues and part understands italian. The speaker speaks spanish. We have the interpreters for each language but we want the participants to listen, not only to the interpreter but also the speaker, but the automatic audio volume reduction of the speaker compared to the interpreter doesnt allow us to do so. Is there a way to disable the automatic volume reduction of the speaker when you, as a participant, are listening to an interpreter? please i need help. If i didnt explain myself tell me and ill try to rephrase it better