mp3in — Reads stereo audio data from an external MP3 file.
ifilcod -- integer or character-string denoting the source soundfile name. An integer denotes the file soundin.filcod ; a character-string (in double quotes, spaces permitted) gives the filename itself, optionally a full pathname. If not a full path, the named file is sought first in the current directory, then in that given by the environment variable SSDIR (if defined) then by SFDIR.
iskptim (optional) -- time in seconds of input sound to be skipped. The default value is 0.
iformat (optional) -- specifies the audio data file format: currently not implemented and always defaults to stereo.
iskipinit (optional) -- switches off all initialisation if non zero (default =0).
ibuffersize (optional) -- sets the internal buffer size for reading. If the value is zero or negative it defaults to 4096 bytes.