RTL_SDR rtl_fm write to file with SOX post production

Write sound to file

</s>rtl_fm -M fm -f 432.500M -g 48 -E dc -s 24000 | sox -r 24k -t raw -e s -b 16 -c 1 -V1 - radio.wav highpass 10 gain 10.811<e>

Play to soundcard
`rtl_fm -f 434.400M -M nfm -s 12.5k -l 15 -t 1 -g 30 | play -r 12.5k -t raw -e s -b 16 -c 1 -V1 -`

Scan and play to soundcard
`rtl_fm -f 430M:435M:25k -M nfm -s 25k -l 48 -t 1 -g 28 | play -r 25k -t raw -e s -b 16 -c 1 -V1 -`