Potential private-use mapping for Impulse Tracker's internal characters

it_unicode.txt

Impulse Tracker uses a weird font based on CP437, but with custom glyphs in
positions 0x80 through 0xC9. This is an attempt to map these glyphs to a
Unicode private use area in a somewhat rational manner (i.e. grouping related
characters within 16-character blocks).

I chose the block from U+E830 to U+E87F, which corresponds to the ConScript
block for Deseret (or rather, what *was* Deseret prior to its inclusion in the
Unicode standard as of version 3.1). I am not aware of any other significant
use cases for characters in this range. In theory, there is room for 16 more
characters, since Deseret extends to U+E88F, but that much space isn't needed.

Glyphs are listed after the U+xxxx for testing with existing fonts.


U+E830     80      IMPULSE TRACKER BOX DRAWINGS LIGHT TOP AND LEFT EDGE
U+E831     81      IMPULSE TRACKER BOX DRAWINGS LIGHT TOP EDGE
U+E832     82      IMPULSE TRACKER BOX DRAWINGS LIGHT TOP AND RIGHT EDGE
U+E833     83      IMPULSE TRACKER BOX DRAWINGS LIGHT LEFT EDGE
U+E834     84      IMPULSE TRACKER BOX DRAWINGS LIGHT RIGHT EDGE
U+E835     85      IMPULSE TRACKER BOX DRAWINGS LIGHT BOTTOM AND LEFT EDGE
U+E836     86      IMPULSE TRACKER BOX DRAWINGS LIGHT BOTTOM EDGE
U+E837     87      IMPULSE TRACKER BOX DRAWINGS LIGHT BOTTOM AND RIGHT EDGE
U+E838     88      IMPULSE TRACKER BOX DRAWINGS LIGHT TOP LEFT CORNER
U+E839     89      IMPULSE TRACKER BOX DRAWINGS LIGHT TOP RIGHT CORNER
U+E83A     8A      IMPULSE TRACKER BOX DRAWINGS LIGHT BOTTOM LEFT CORNER
U+E83B     8B      IMPULSE TRACKER BOX DRAWINGS LIGHT BOTTOM RIGHT CORNER
U+E83C     8C      IMPULSE TRACKER LOWER LEFT TRIANGLE
    - or just use U+25E3 BLACK LOWER LEFT TRIANGLE
U+E83D     8D      IMPULSE TRACKER UPPER RIGHT TRIANGLE
    - or just use U+25E5 BLACK UPPER RIGHT TRIANGLE
U+E83E     9A      IMPULSE TRACKER HORIZONTAL SEPARATOR LINE
    - usually thin dotted line - e.g. between top section and page, or within complex widget groups
U+E83F     A8      IMPULSE TRACKER VERTICAL SEPARATOR LINE
    - usually a very thick block - e.g. between sample text and "Play"
U+E840     8E      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP AND LEFT EDGE
U+E841     8F      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP EDGE
U+E842     90      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP AND RIGHT EDGE
U+E843     91      IMPULSE TRACKER BOX DRAWINGS HEAVY LEFT EDGE
U+E844     92      IMPULSE TRACKER BOX DRAWINGS HEAVY RIGHT EDGE
U+E845     93      IMPULSE TRACKER BOX DRAWINGS HEAVY BOTTOM AND LEFT EDGE
U+E846     94      IMPULSE TRACKER BOX DRAWINGS HEAVY BOTTOM EDGE
U+E847     95      IMPULSE TRACKER BOX DRAWINGS HEAVY BOTTOM AND RIGHT EDGE
U+E848     96      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP LEFT CORNER
U+E849     97      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP RIGHT CORNER
U+E84A     98      IMPULSE TRACKER BOX DRAWINGS HEAVY BOTTOM LEFT CORNER
U+E84B     99      IMPULSE TRACKER BOX DRAWINGS HEAVY BOTTOM RIGHT CORNER
U+E84C     A9      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP EDGE WITH CURSOR INDICATOR
U+E84D     AA      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP EDGE WITH EDIT MASK INDICATOR
U+E84E     AB      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP EDGE WITH CURSOR AND EDIT MASK INDICATOR
U+E84F     AC      IMPULSE TRACKER BOX DRAWINGS HEAVY TOP EDGE WITH MULTI-CHANNEL INDICATOR
U+E850     9B      IMPULSE TRACKER THUMB BAR 1
U+E851     9C      IMPULSE TRACKER THUMB BAR 2
U+E852     9D      IMPULSE TRACKER THUMB BAR 3
U+E853     9E      IMPULSE TRACKER THUMB BAR 4
U+E854     9F      IMPULSE TRACKER THUMB BAR 5
U+E855     A0      IMPULSE TRACKER THUMB BAR 6
U+E856     A1      IMPULSE TRACKER THUMB BAR 7
U+E857     A2      IMPULSE TRACKER THUMB BAR 8
U+E858     A3      IMPULSE TRACKER THUMB BAR 9
U+E859     A4      IMPULSE TRACKER THUMB BAR 10
U+E85A     A5      IMPULSE TRACKER THUMB BAR 11
U+E85B     A6      IMPULSE TRACKER THUMB BAR 12
U+E85C     A7      IMPULSE TRACKER THUMB BAR 13
U+E85D  
U+E85E  
U+E85F  
U+E860     AE      IMPULSE TRACKER VU METER 1
U+E861     AF      IMPULSE TRACKER VU METER 2
U+E862     B0      IMPULSE TRACKER VU METER 3
U+E863     B1      IMPULSE TRACKER VU METER 4
U+E864     B2      IMPULSE TRACKER VU METER 5
U+E865     B3      IMPULSE TRACKER VU METER 6
U+E866     B4      IMPULSE TRACKER VU METER 7
U+E867     B5      IMPULSE TRACKER VU METER 8
U+E868     B6      IMPULSE TRACKER VU METER 9
U+E869  
U+E86A     CD      IMPULSE TRACKER NOTE-OFF INDICATOR
    - or just encode as U+2550?
U+E86B     BF      IMPULSE TRACKER LEFT DEFAULT VOLUME BRACKET
U+E86C     C0      IMPULSE TRACKER RIGHT DEFAULT VOLUME BRACKET
U+E86D     AD      IMPULSE TRACKER MIDDLE DOT
    - empty data in pattern editor + indicator for "old" notes
    - maybe map to an existing unicode char?
U+E86E     B8      IMPULSE TRACKER HALFWIDTH MIDDLE DOT PAIR                   for empty halfwidth data in pattern editor
U+E86F     B7      IMPULSE TRACKER NOTE PLAYBACK INDICATOR
    - for "new" notes - could map to existing char?
U+E870     C1      IMPULSE TRACKER NOTE DOT 1
U+E871     C2      IMPULSE TRACKER NOTE DOT 2
U+E872     C3      IMPULSE TRACKER NOTE DOT 3
U+E873     C4      IMPULSE TRACKER NOTE DOT 4
U+E874     C5      IMPULSE TRACKER NOTE DOT 5
U+E875     C6      IMPULSE TRACKER NOTE DOT 6
U+E876     C7      IMPULSE TRACKER NOTE DOT 7
U+E877     C8      IMPULSE TRACKER NOTE DOT 8
U+E878     C9      IMPULSE TRACKER NOTE DOT 9
U+E879  
U+E87A     B9      IMPULSE TRACKER LEFT HALF SINE WAVEFORM
U+E87B     BA      IMPULSE TRACKER RIGHT HALF SINE WAVEFORM
U+E87C     BB      IMPULSE TRACKER LEFT HALF SQUARE WAVEFORM
U+E87D     BC      IMPULSE TRACKER RIGHT HALF SQUARE WAVEFORM
U+E87E     BD      IMPULSE TRACKER LEFT HALF SAWTOOTH WAVEFORM
U+E87F     BE      IMPULSE TRACKER RIGHT HALF SAWTOOTH WAVEFORM