Support for function to get raw pcm data

[yeonns]

Now, we can get string result when we listen() with EuRxManager.
But, I want to get raw pcm deta result.
With these raw pcm data, we can utilize them as AI dataset. 😄

So, how about supporting this feature?

[designe]

It is an interesting idea 👍
Let me implement this export feature & reflect it in the next patch :)

[yeonns]

Thank you! 😄