[sdiy] MIDI bytestream parser

[Neil Johnson]

Olivier,

> I think it's just shifting the channel number from 1-16 (what's
> exposed to the user) to 0-15 values (what's used internally by MIDI).
>
> The HASH( ) is used to implement a lookup map from status byte to
> handler function, by observing that there are no two status byte with
> the same nibble checksum (they are either nx, with n between 8 and E
> and x for channel messages, or Fn, with n below 8 for system messages.

Spot on!

Neil
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