> How about "Midi is a superset of a piano roll"
>

I somehow think the standards committee might regard that as just a tiny bit 
oversimplified. But the concept is very close. The piano roll is just a 
paradigm to visualize the time, value and duration of MIDI events. Just as 
useful is the traditional musical notation paradigm although neither can 
effectively represent all types of data which might be found in the MIDI 
data stream. Things like patch parameters and polyphonic aftertouch not to 
mention many others.

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