Music Components Included in QuickTime Individual music components act as device drivers for each type of synthesizer attached to a particular computer.
Developers can add other music components for specific hardware and software synthesizers.
Applications do not usually call music components directly. Instead, the note allocator or tune player handles music component interactions. In order for an application to call a music component directly, you must first allocate a note channel and then use NAGetNoteChannelInfo and NAGetRegisteredMusicDevice to get the specific music component and part number. You can use these functions to initialize a part to a specified instrument and to get lists of available instrument and drum kit names. You can also get detailed information about each instrument from the synthesizer and get information about and set knobs and controllers.