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audiornnoise: sends wrongly scaled data to nnnoiseless

audiornnoise takes audio/x-raw format=F32LE. However, the nnnoiseless library doesn't take input in the [-1, 1] range, but [-32767.0, 32767.0]: https://github.com/jneem/nnnoiseless/issues/8.

I believe the correct way would be for the audiornnoise element to have format=S16LE in its caps, and convert those values to/from floats when passing them to the denoisers.

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