Apple II
File Type Notes
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                                                  Developer Technical Support


File Type:         $D5 (213)
Auxiliary Type:    All

Full Name:     Music Sequence File
Short Name:    Music Sequence

Written by:    Matt Deatherage                                   January 1990

Files of this type and auxiliary type contain musical sequences.
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Files of type $D5 contain data that is to be interpreted as a sequence of 
musical notes.  A musical sequence can take several forms.  It can be the data 
necessary for a music program to recreate the sequence aurally or visually; it 
can be information that is fed through sequencing hardware to produce the 
appropriate sounds; it can be a list of resource numbers that give a program 
the necessary means to recreate a sequence of music.  The possibilities are 
virtually limitless.  The most common use of sequences is to reproduce music 
aurally (through sound hardware internal or external to the system) or 
visually (to produce music notation on a screen or on paper).

The following auxiliary type assignments are current for this file type as of 
the publication date of this Note:

        Auxiliary Type  Short Name                    Developer
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        $0000           Music Construction Set song*  Electronic Arts
        $8002           Diversi-Tune Sequence         DSR
        $8003           Master Tracks Jr. sequence    Passport
        $8004           Music Writer document         PyGraphics
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                     Table 1-Auxiliary Type Assignments

The auxiliary types for this file type are reserved; any not listed in this 
Note or About File Type Notes must be assigned by Apple Computer, Inc.  Using 
any file type or auxiliary type not assigned may result in conflicting 
identification of files by totally unrelated programs.  To obtain an auxiliary 
type assignment in this file type, see About File Type Notes.

    *  Although Electronic Arts' program Music Construction Set for the 
       Apple IIGS only creates sequences of this file type and auxiliary 
       type $0000, the program actually attempts to read any file with 
       type $D5.  Creators of sequence files may wish to note this 
       irregularity in their documentation.
