Hacking:RTL-SDR
freq="151.515123M"
rtl_fm -M fm -f ${freq} -g 20 -l 10 | \
sox --buffer 128 -t raw -r 12k -es -b 16 -c 1 - -p sinc 200-3.5k compand 0.1,0.8 6:0,-3 | \
tee > ${freq}hz.wav | \
play --buffer 128 -p
freq="151.515123M"
rtl_fm -M fm -f ${freq} -g 20 -l 10 | \
sox --buffer 128 -t raw -r 12k -es -b 16 -c 1 - -p sinc 200-3.5k compand 0.1,0.8 6:0,-3 | \
tee > ${freq}hz.wav | \
play --buffer 128 -p