Hi, I am trying to us sox as part of an RF signal processing daemon on a Raspberry Pi 3B Stretch. When I execute sox from a terminal command line the output file is created, but when I spawn the command it runs but doesn't create the output file: runs and creates '0.wav': sox -r 32k -t raw -e s -b 16 -c 1 0.raw -r 12k 0.wav runs but doesn't create '0.wav': sox -r 32k -t raw -e s -b 16 -c 1 0.raw -r 12k 0.wav redirecting stdin/out/err and it still doesn't create '0.wav': sox -r 32k -t raw -e s -b 16 -c 1 0.raw -r 12k 0.wav &> out.log < /dev/null & the sox output seems the same in all cases and echo $? print 0 == success. What am I missing? thanks Rob -- Rob Robinett AI6VN rob@robinett.us mobile: +1 650 218 8896