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Add OPL volume level research data. 

Subversion-branch: /research
Subversion-revision: 1486
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Simon Howard 2009-03-16 22:21:02 +00:00
parent 53b05f9349
commit 401de76a45
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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
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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