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for file in *.m4a; do name=`echo $file | sed "s/\ /\_/g" | sed "s/.m4a//"`; \
echo "Convert m4a $file to $name.wav"; faad -o $name.wav "$file" > /dev/null 2>&1; \
for rate in 8000 16000 32000 48000; do mkdir -p $rate; \
echo "Creating $rate kHz -> $rate/$name.wav"; \
sox $name.wav -c 1 -r $rate $rate/$name.wav vol 0.06; \
done; \
rm -f *.wav; \
done;