Isn't it using Opus? Much superior to MP3 for voice and the patents are royality free. RecorderJS seems to at least use Opus. But what if you roll out your own

Isn't it using Opus? Much superior to MP3 for voice and the patents are royality free. RecorderJS seems to at least use Opus. But what if you roll out your own compressor using the same FFT Technology? There's quite a bit more to modern codecs than that.