Designing Games with Game Maker - YoYo Games

outside this the volume is indicated with voloutside. To be precise,
CD music
voloutside is a negative number that indicates the number of hundreds of
decibel that must be subtracted from the inside volume. Between the inside
and outside angle the volume gradually decreases.
This functionality is only available in the Pro Edition of Game Maker.
There are also a number of functions dealing with playing music from a CD.
cd_init() Must be called before using the other functions. Should also be
called when a CD is changed (or simply from time to time).
cd_present() Returns whether a CD is present in the default CD drive.
cd_number() Returns the number of tracks on the CD.
cd_playing() Returns whether the CD is playing.
cd_paused() Returns whether the CD is paused or stopped.
cd_track() Returns the number of the current track (1=the first).
cd_length() Returns the length of the total CD in milliseconds.
cd_track_length(n) Returns the length of track n of the CD in
milliseconds.
cd_position() Returns the current position on the CD in milliseconds.
cd_track_position() Returns the current position in the track being
played in milliseconds.
cd_play(first,last) Tells the CD to play tracks first until last. If you want
to play the full CD give 1 and 1000 as arguments.
cd_stop() Stops playing.
cd_pause() Pauses the playing.
cd_resume() Resumes the playing.
cd_set_position(pos) Sets the position on the CD in milliseconds.
cd_set_track_position(pos) Sets the position in the current track in
milliseconds.
cd_open_door() Opens the door of the CD player.
cd_close_door() Closes the door of the CD player.
There is one very general function to access the multimedia functionality of windows.