[sdiy] Handling MIDI Running Status from Power-up

Neil Johnson neil.johnson71 at gmail.com
Thu Nov 14 16:45:53 CET 2019

On Thu, 14 Nov 2019 at 15:34, chris <chris at chrismusic.de> wrote:
> That's what I thought too, but the *sender* would have to recognize the
> interruption, in order to send a fresh status byte.
> It's correct that the *receiver* is able to notice missing Active Sense,
> but in this case it can't make any use of it - it still doesn't know the
> missing status byte.
> If the MIDI gods had thought of acknowledged Active Sense, this would
> work.
> But then, with some dozen other bells'n'whistles, we'd have something
> like USB. I'm glad they didn't...

They already considered this in the spec:

"If Running Status is being used and a receiver is connected to a
transmitter after the transmitter has
powered on it will not play until the next Status byte is transmitted.
For this reason it is recommended
that the status be refreshed every few seconds."

(page A-2 in the online PDF version).


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