Simulcast for audio

Dear all,
I wonder whether WebRTC support also the simulcast for audio ? If not does jitsi have such tentation to do so? In my opinion although the bandwidth of audio is small (about 50kbps) we can even increase / decrease it in a certain circumstance for instance to transmit a concert (so high BW necessary), to support a lot of people speak at the same time… In such a case an adaptive streaming for audio would be a good solution.