[PoP]

With this small change works fine on the PW3:

#!/bin/sh
# script to play a local file on pw4

# add required library

export LD_LIBRARY_PATH=/mnt/us/extensions/sox/library:$LD_LIBRARY_PATH

# get soxi data from file to be played

/mnt/us/extensions/sox/soxi "$1" >/var/tmp/soxidata.txt

# now to parse necessary information

Chan=$(awk -F: '/Channels/ {gsub(" ","");print $2}' /var/tmp/soxidata.txt)

Wide=$(awk -F: '/Precision/ {gsub(" ","");gsub("-bit","");print $2}' /var/tmp/soxidata.txt)

Rate=$(awk -F: '/Sample Rate/ {gsub(" ","");print $2}' /var/tmp/soxidata.txt)

rm /var/tmp/soxidata.txt

# now determine how to play it

driver="unknown"

which aplay>/dev/null && driver="alsa"

which gst-launch>/dev/null && driver="gst"

# now start playing

case "$driver" in

     alsa)

     /mnt/us/extensions/sox/sox "$1" -t wav - -- |  aplay
     ;;

     gst)

     /mnt/us/extensions/sox/sox "$1" -t raw - -- |  /usr/bin/gst-launch \
     filesrc location=/dev/stdin \
     ! audio/x-raw-int, \
        endianness='(int)'1234, \
        signed='(boolean)'true, \
        width='(int)'$Wide, \
        depth='(int)'$Wide, \
        rate='(int)'$Rate, \
        channels='(int)'$Chan \
     ! queue \
     ! mixersink&
     ;;

     *)

     echo "Unknown sound driver, cannot play media."
     ;;
esac