Hello,

I have a question about MIDI specification 1.0:

Usually the faders and knobs of a MIDI controller have a much higher resolution than MIDI, so their values
are converted to the 0-127 (int) MIDI range. So when I move a fader slowly the conversion result can be the
same integer value several times before the next step from 0-127 is reached.
All MIDI controllers I know output a CC message with a certain value only ONCE and then stay quiet until the
next step is reached. So whatever I do, no matter how slow I move a fader the CC message goes 89, 90, 91, 92.

Now I came across a controller that sends the same CC value multiple times.
If I move the fader slowly it goes 89, 89, 89, 90, 90, 90, 91, 91, 92, 92.

It does not cause any direct harm, but I'm curious if this complies with MIDI specification.

I can't see any use in sending the CC message multiple times - it is redundant, the receiving device just does not
change anything when receiving the same CC value several times. So no benefit on the pro side.

On the negative side I see possible problems with very old MIDI devices that tend to get in trouble with processing
data input in time or crash when receiving too much (in this case unnecessary) MIDI data. And while it does not really
matter for USB MIDI, the oldschool hardware MIDI 1.0 connections have a very low bandwidth, so flooding them with
unnecessary data seems not advisable as it can easily cause timing problems.

So my question is:
Do you think the points on the negative side are valid?
Does the MIDI 1.0 standard forbid or advise against sending redundant data?
If not, is it considered good practice not to send redundant data (as I said all controllers I know follow this practice)?

Thanks in advance!
Joern