reduce yousician sound effects volume on Mac OS X / Linux

ysilence.sh

#!/bin/bash
# Purpose: Silence down yousician sound effects on Mac OS X
# Usage: ./ysilence.sh
# Requirements: ffmpeg installed (brew install ffmpeg)

# USE AT YOUR OWN RISK!

# However, you can fixed damaged installations by just removing the Yousician.app folder
# inside /Applications/Yousician Launcher.app

# Adjust this path to your needs, ysilence will lookup the soundseffect below this path
YS_PATH="/Applications/Yousician Launcher.app/"

WDIR=$(mktemp -d)
IFS=$(echo -en "\n\b")

function die
{
    echo $1
    exit 1
}

function silence_file
{
    file="$1"
    echo silencing $file to $WDIR/tmp.ogg
    fileb=$WDIR/tmp.ogg
    rm -f $fileb
    ffmpeg -i "$file" -filter:a "volume=0.01" -strict -2 -ac 2 -acodec vorbis $fileb || return 1
    echo replacing $file by $WDIR/tmp.ogg
    cp $fileb "$file"
}

echo checking ffmpeg
which ffmpeg || die "no ffmpeg installed"

echo checking yousician files
FILES=$(find "$YS_PATH" -regex ".*EncodedAudio.*\.ogg")
for file in $FILES; do
    silence_file "$file"
done;

die EOT
rm -rf $WDIR