Hi, @takagi.305216,
Welcome to the Developer Forum – happy to help here. First, can you share if you are looking to access raw audio data? Or looking to record each participant on a separate audio track? If the latter, see our support article on this topic below:
Enabling and starting local recordings
That aside, you can leverage the livestreaming feature to capture audio as a workaround. Here is a helpful guide on Live Streaming with RTMP