[gmpi] Re: [OT] Re: 3.15 MIDI

  • From: "Tom White" <twhite@xxxxxxxx>
  • To: <gmpi@xxxxxxxxxxxxx>
  • Date: Wed, 16 Jun 2004 18:38:55 -0700

> >>If only MSB or MSB+LSB is allowed, why did they not choose
> >>MSB or LSB+MSB?

Did I miss something? Aren't there three options?

According to my copy of the Spec you can use just the MSB if you
want only 7 bits of resolution, or you can use both if you want
14 bits. In the latter case, *after* using both you can then send
just the LSB if you want to make a fine adjustment, or you can
send just the MSB if you want to make a course adjustment.

That makes three options: "only MSB", "MSB+LSB", *and* "only LSB".
 
> There seems to be an assumption that installing a few-msec
> timeout on receipt of MSB messages is cheap...
> AFAICT, its a design weakness, perhaps even a flaw - I've
> never seen or heard anything yet to contradict this conclusion.

The spec say that "when an MSB is received, a receiver should
set its concept of the LSB to zero". No timeout is stated, or
implied, nor should be assumed, I think.

- Tom White


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