mac (Monkey's Audio Linux port) Monkey's Audio (aka APE) is a lossless audio compression format, similar to FLAC. mac is a console frontend to Monkey's Audio, able to encode and decode APE audio files. Note: if you just want to listen to APE files, Slackware's mplayer and audacious can already play them. If you just want to convert them to some other format (wav, mp3, etc), Slackware's ffmpeg can already decode them. The only real reason to install this package is for converting files *to* APE format. Note: if you get "invalid input file" trying to encode a wav file, or if the resulting APE file sounds like noise, it probably means the wav file uses floating point rather than 16-bit integer samples. You can convert with sox: sox -G input.wav -b16 output.wav