Yamaha MU-series
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The Yamaha MU5 was an early sound module, commonly used back in the days of computers having the Intel 80386 processor, in which a computer could send MIDI commands to the MU5, acting as an external sound generation device.
[edit] Power supply
The MU5 ran on six AA batteries, or on an external DC supply.
[edit] Display
The display showed 16 bargraphs, one for each MIDI channel.