Had to install play (from sox) in /usr/bin
Gqrx came with the rtl command set – you can run the commands from
/Applications/Gqrx.app/Contents/Macos/
This command tunes to FM broadcast and plays
./rtl_fm -f 90100000 -W -s 200000 -r 48000 - | play -r48000 -t s16 -L -c 1 -