Which channels are involved in Osmo Pocket 4's OsmoAudio four-channel output? Which channels are the internal dual channels?

For Osmo Pocket 4, OsmoAudio supports the following four output channels:

• Two channels from the DJI Mic 2/Mic 3/Mic Mini transmitters.
• Two channels (left and right) from Osmo Pocket 4's built-in microphone array.

The internal dual channels refer to the left and right channels recorded by the built-in microphone array.