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51 lines
815 B
Ruby
Executable file
51 lines
815 B
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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def 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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end
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# Instrument 17 has normal tuning, instrument 18 is +10
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program_change(0x1, 1, 17)
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program_change(0x1, 2, 18)
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# Play through some notes, making the same note on each of the two channels.
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for i in 10..64
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note_on(10, 1, i, 100)
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note_on(10, 2, i, 100)
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note_off(10, 1, i)
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note_off(0, 2, i)
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end
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# end of track
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end_of_track
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