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91 lines
2.9 KiB
Ruby
Executable file
91 lines
2.9 KiB
Ruby
Executable file
#!/usr/bin/env ruby
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def note_on(delay, channel, note, volume)
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# note on
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putc delay * 6
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putc 0x90 + channel
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putc note
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putc volume
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end
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def note_off(delay, channel, note)
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# note on
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putc delay * 6
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putc 0x80 + channel
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putc note
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putc 0x00
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end
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def program_change(delay, channel, instrument)
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putc delay * 6
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putc 0xc0 + channel
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putc instrument
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end
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program_change(0x1, 8, 9)
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program_change(0x1, 1, 7)
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program_change(0x1, 2, 7)
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# Turn on some notes and then turn them off, to boost us
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# up to the middle of the range of operators.
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note_on(0xf, 8, 0x20, 0x40) # voice 1
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note_off(0xf, 8, 0x20)
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note_on(0xf, 8, 0x21, 0x40) # voice 2
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note_off(0xf, 8, 0x21)
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note_on(0xf, 8, 0x22, 0x40) # voice 3
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note_off(0xf, 8, 0x22)
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# Play some notes until we use up all the OPL operators.
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note_on(0xf, 8, 0x20, 0x40) # voice 4
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note_on(0xf, 1, 0x21, 0x40) # voice 5
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note_on(0xf, 2, 0x22, 0x40) # voice 6
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note_on(0xf, 8, 0x23, 0x40) # voice 7
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note_on(0xf, 1, 0x24, 0x40) # voice 8
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note_on(0xf, 2, 0x25, 0x40) # voice 1
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note_on(0xf, 8, 0x26, 0x40) # voice 2
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note_on(0xf, 1, 0x27, 0x40) # voice 3 3-2-1-8-7-6-5-4
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# Now all voices are in use ...
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# "no alt" = no inferior channels, first voice from same channel used
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note_on(0xf, 8, 0x28, 0x40) # gets v2 2-3-1-8-7-6-5-4 chan 8 < chan 1 (no alt)
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note_on(0xf, 1, 0x29, 0x40) # gets v2 chan 1 > chan 8
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note_on(0xf, 2, 0x2a, 0x40) # gets v7 7-2-3-1-8-6-5-4 chan 8 < chan 1+2
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note_on(0xf, 8, 0x2b, 0x40) # gets v4 4-7-2-3-1-8-6-5 chan 8 < chan 1+2 (no alt)
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note_on(0xf, 1, 0x2c, 0x40) # gets v4 chan 1 > chan 8
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note_on(0xf, 2, 0x2d, 0x40) # gets v7 7-4-2-3-1-8-6-5 chan 2 < chan 1 (no alt)
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note_on(0xf, 8, 0x2e, 0x40) # gets v7 chan 8 > chan 2? (no alt?)
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note_on(0xf, 1, 0x2f, 0x40) # gets v7 chan 1 > chan 8
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note_on(0xf, 2, 0x30, 0x40) # gets v1 1-7-4-2-3-8-6-5 chan 2 < chan 1 (no alt)
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note_on(0xf, 8, 0x31, 0x40) # gets v1 chan 8 > chan 2? (no alt?)
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# voices off: 5, 7, 1, 3, 2, 8, 6, 4, 0
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note_off(0xf, 8, 0x20)
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note_off(0xf, 1, 0x21)
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note_off(0xf, 8, 0x22)
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note_off(0xf, 1, 0x23)
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note_off(0xf, 8, 0x24)
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note_off(0xf, 1, 0x25)
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note_off(0xf, 8, 0x26)
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note_off(0xf, 1, 0x27)
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note_off(0xf, 8, 0x28)
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note_off(0xf, 1, 0x29)
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note_off(0xf, 8, 0x2a)
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note_off(0xf, 1, 0x2b)
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note_off(0xf, 8, 0x2c)
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note_off(0xf, 1, 0x2d)
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note_off(0xf, 8, 0x2e)
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note_off(0xf, 1, 0x2f)
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note_off(0xf, 8, 0x30)
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note_off(0xf, 1, 0x31)
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# end of track
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putc 0x00
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putc 0xff
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putc 0x2f
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putc 0x00
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