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Add OPL volume level research data.

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Subversion-revision: 1486
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Simon Howard 2009-03-16 22:21:02 +00:00
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opl/README
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@ -16,3 +16,7 @@ Research data from investigating Chocolate Doom OPL MIDI playback.
volume Examination of how scale level values are affected by volume Examination of how scale level values are affected by
menu volume setting. menu volume setting.
level Constructed MIDI to play a note at each volume level
in order to determine the register values for MIDI
volumes.

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Test MIDI file to play a note at each volume level in sequence, to see how
MIDI volumes are mapped to register values.

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#!/usr/bin/env ruby
NOTE=0x20
for i in 0...128
# set volume to zero
putc 0x00
putc 0xb8
putc 0x07
putc 0x00
# note on
putc 0x0f
putc 0x98
putc NOTE
putc 0x7b
# Set volume
putc 0x00
putc 0xb8
putc 0x07
putc i
# delay
putc 0x0f
# note off
putc 0x88
putc NOTE
putc 0x00
end
# end of track
putc 0x00
putc 0xff
putc 0x2f
putc 0x00

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