I have noted that there are several different ways to capture audio such as x-wav, wave, pcm etc.

Is that the setting I should use in order to "turn off" the noise and echo cancellation of the phone? Or is that not possible? My Tests suggests it is not.

Also: Currently I use 8bits to record the sound, however that seems to not be nearly enough. Is it possible to use anything else?

I have tried: "capture//audio?bits=16" that seems to gives me an error.
However "capture://audio?bits=8" runs smoothly.

So two questions: change the bit setting
Record sound without native noise and echo cancellation