
The instruments may also be virtual-software packages residing on a personal computer. A central MIDI controller, such as a keyboard, can be used to convey musical instructions to one or more MIDI instruments-for instance, an electronic drum machine or a second keyboard. MIDI comprises a set of defined instructions, or MIDI messages, telling a compatible instrument which notes to play, how hard to strike them, with what effects (such as vibrato or sustain), and at what tempo and relative volume. Hack into this quiz and let some technology tally your score and reveal the contents to you.

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