[sdiy] Midi problems

Tim Ressel madhun2001 at yahoo.com
Wed Apr 3 22:55:58 CEST 2002


Aha! That explains those wierd 2-byte
non-command-bit-set packets I see!  

Its all becomming clear now...yeah, right!


--TR

> Most keyboards implement note off as a note on
> message with
> zero velocity. The reason being is that they can use
> running
> status. Running status allows one to not resend a
> status byte
> if the next message has the same status. So intead
> of a key
> down and up being:
> 
> 0x90 0x64 0x64 
> 0x80 0x64 0x0
> 
> you'll have:
> 
> 0x90 0x64 0x64
> 0x64 0x00        <= no need to resend 0x90
> 
> A note on with velocity zero is equal to a note off.
> 
> Tomy
> 
> 


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