"D" commands: DE = group delete, DR = disk drive letter, DI = dim.
              DOS = give DOS command, DP = make staves disappear

         In edit mode only:
             DE = delete the item
             Dn = move the item down 'n' scale steps

DE, the group delete, works like the move command except that only the
1st staff- position-code number prompt is given.

    "Type staff #, left position, right position, [code #, upper staff #]"

        Up to 5 numbers may be typed.  The 1st number should be that of the
        lowest staff involved in the delete - unless the command is to involve
        all staves at once, in which case type any number greater than the
        highest possible staff number (16 in this program).
        The 2nd and 3rd numbers set the limits of the material to be deleted.
        If the the 3rd number is zero then the default right hand limit will
        be position 220.  If the the 4th number is not zero then only items
        with that code number will be deleted.
        If a 5th number appears it will be the number of the uppermost staff to
        be involved in the deletions.

*


        Example -  prompt response: 2 45 137 0 5

            This deletes all material on staves 2 - 5 found between positions
            45 and 137.

 ***** You will always be given the chance backup from the DE command.

        Example -  prompt response: 2 45 137 2 5

            This deletes all rests (code 2) on staves 2 - 5 found between
            positions 45 and 137.


        Example -  prompt response: 3

            This deletes everything on staff 3.

 ***** Special feature: If you type '3 -99', the -99 causes EVERYTHING to be
       deleted EXCEPT material on staff 3.  Use this feature with extreme care!



*

DR = change disk drive letter for finding library files.
       After typing DR the current drive letter is displayed.
       Then a new drive letter is requested.

DI = dim.

     This command is a shortcut for typing a code 9 item.  It should
     normally be followed by 2 or 3 numbers (parameters 2, 3, 4).

         di 3 45 -2   will put "dim." at position 45 on staff 3,
                       vertical position -2.


The following work only while in edit mode.

DE deletes the item currently active in edit mode.  If any changes were
made to the item just before typing DE, the DE command will be ignored.
After a deletetion, the next item in the list will come into edit mode.

Dn moves the item down 'n' steps.  The value of 'n' is "sticky", i.e. typing
the D again, with no number, will move the item down again.  The U command (up)
works the same way.  The same stored value of 'n' is used by both D and U.

*



DP = make staves disappear.

     DP can be followed by up to 16 numbers.  Each number will represent the
     staff that will disappear or re-appear when the Z command is given.

     The numbers following DP will operate on the flip-flop principle.  That
     is, if DP 2 <CR> is typed, and then Z<CR>, all items attached to staff 2
     will disappear from the display.  (The items will still remain in memory
     however.)  If DP 2 <CR> followed by Z <CR> is typed again, the items
     will re-appear.  This command is useful when there are so many items
     being displayed that the program is slowed down while editing.

     DP 99 <CR> Z <CR>  makes data on all staves re-appear.








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