Creating files with RMS gain level instead of Peak

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Hi,

I have been using SoX lately to generate white noise files. However, the gain parameter in SoX only allows specifying amplitude as dBFS Peak. I need dBFS RMS. 

I use the following to generate a file of stereo white noise at -12dBFS Peak:

sox -V -b 24 -r 96000 -n noise_white_stereo_24b_96000Hz_m12dBFSpeak_tpdf_10s.wav synth 10 whitenoise whitenoise gain -12 dither

How can I get gain of -12dBFS RMS?


Thanks.
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