Information About Three or More Voice Handling in a Web Browser

質問Question Summary 】
　Would it be possible to obtain more than three microphone sounds through a browser such as Chrome?

Environment
Our environment is as follows.
·Windows 10pro
·Google Chrome version: 64.0
·Connect the audio interface (with 3 or more inputs) to the PC.
　Connect multiple microphones to the audio interface.

[Question details]
Want to handle audio in your browser (Google Chrome)
Implemented in javascript.
I was able to confirm that 2ch of audio was coming into the browser using getUserMedia() and AudioContext.
3ch and later do not enter Google Chrome.

Check to see if the audio is coming in
Use getUserMedia() or AudioContext to display waveforms on your browser. I checked if the waveform is shaking.

How can I handle more than 3ch of voice with chrome?
Even if you look at the input on the Recording tab of the Windows sound settings,
The meter swings for 1ch and 2ch sounds, but

when connected to 3ch or later of the audio interface The meter doesn't shake.
I think it might be a restriction around Windows sound drivers.
If anyone knows anything, please let me know.