"Z" = zoom.  For changing the size or position of the image in the window.


To change the size of the image...

Z n x y = zoom to n times the normal size and move percentage positions
          x and y to center of screen.  The default screen display is
          Z 1 50 50.  This means zoom to size 1 and place the horizontal
          point which is 50% of the way across the screen to the center point,
          etc. (which, of course, is redundant.)

          Z 2 20 10 zooms to double size and takes the point 20% of the
          distance from the left to right and 10% of the distance from bottom
          to top and places it at the center of the screen.



*

To change the position of the image...

ZL n = move the "window" n% of the screen width to the left.
ZR n =  "    "      "    "   "  "     "     "    "  "  right.
ZU n =  "    "      "    "   "  "     "   height upward
ZD n =  "    "      "    "   "  "     "   height downward

   The number n is "sticky" with the left-right, up-down commands.

Z 1 = bring image back to normal size.

Z alone does the same as Z 1 but all vectors are recomputed.  The Z command
    must always be used if the staff lines themselves are edited, etc.



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