On Thursday, July 8, 2021, Martin Mathieson via Wireshark-dev <
wireshark-dev@wireshark.org> wrote:

> These mask fields (0x7f7f, 0x7f7f7f7f, etc) look wrong to me, but I am
> worried I might be missing something?
>

Seems perfectly fine to me. This dates back to MIDI over serial line where
the most significant bit indicates realtime event. Realtime events can
appear anytime on the serial line. Normal communication, including system
exclusive messages, always have most significant bit cleared.
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