mp3 cut sox first and last n seconds

#!/bin/bash
# NOTE : Quote it else use array to avoid problems #

for f in  `ls *.mp3`
do
  echo "------Start------"
  echo "Processing $f file..."
  fbname=$(basename "$f" | cut -d. -f1)
  newname="${fbname}_output.mp3"
  echo "Output: ${newname}"

  sox $f  $newname  trim 10 -10
  echo "--------End------"
  # take action on each file. $f store current file name
  #cat "$f"
done