How to convert .ape to smth usable.
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cd /usr/ports/audio/mac && make install clean
cd /usr/ports/sysutils/bchunk && make install clean
mac Queen.ape Queen.wav -d # get a big wav file
bchunk -w Queen.wav Queen.cue Queen # split the wav file

flac+cue to mp3:

portinstall shntool
shnsplit -O always -f Queen.cue -t "%n.%t" -o "cust ext=mp3 lame -h - %f" Queen.flac

flac to mp3:

flac -c -d <flacfile>| lame - <mp3file>

m4a to wav to mp3:

for i in *.m4a; do
    mplayer -ao pcm "$i" -ao pcm:file="${i%.m4a}.wav"
done

for i in *.wav; do
    lame -h -b 192 "$i" "${i%.wav}.mp3"
done