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83 lines
2.3 KiB
Ruby
Executable file
83 lines
2.3 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
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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
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putc 0x90 + channel
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putc note
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putc 0x00
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end
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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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# a quiet note, to check if volume affects it
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note_on(0xf, 8, 0x22, 0x10) # voice 6
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note_on(0xf, 1, 0x23, 0x40) # voice 7
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note_on(0xf, 8, 0x24, 0x40) # voice 8
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note_on(0xf, 1, 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
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# Now all voices are in use ...
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note_on(0xf, 8, 0x28, 0x40) # gets v2
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note_on(0xf, 1, 0x29, 0x40) # gets v2
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note_on(0xf, 8, 0x2a, 0x40) # gets v8
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note_on(0xf, 1, 0x2b, 0x40) # gets v8
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note_on(0xf, 8, 0x2c, 0x40) # gets v6
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note_on(0xf, 1, 0x2d, 0x40) # gets v6
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note_on(0xf, 8, 0x2e, 0x40) # gets v4
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note_on(0xf, 1, 0x2f, 0x40) # gets v4
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note_on(0xf, 8, 0x30, 0x40) # gets v0
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note_on(0xf, 1, 0x31, 0x40) # gets v0
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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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