If you have any APE files that youo wish to have in MP3 then read below,

you will require the following:

MAC-Port

Once downloaded enter a terminal and use root and type the following within thye extracted folder:

./configure
make
make install

then you need LAME,
this should be in your package manager

and the same can be said for mp3splt (Notice the missing i from split)

then type the following in a terminal:

# mac ape_file.ape wav_file.wav -d

# lame -V 0 --vbr-new wave_file.wav mp3_file.mp3

and if you have a cue file to split single ape files up:

# mp3splt -a -c cue_file.cue mp3_file.mp3