samer@0: % monofile - Return single channel version of signal in an audiofile
samer@0: %
samer@0: % NB using sndfile with channels=1 option results in clipping due to
samer@0: % crappy implementation of Tritonus PCM2PCM converter.
samer@0: function s=monofile(n), s=mixdown(sndfile(n));