Subj : Re: Beginner needs help with MSB/LSB and 7bit bytes
To   : comp.programming
From : moi
Date : Sat Oct 01 2005 02:35 pm

Rich wrote:
> Thanks Duane. I found a great site for a Korg synth that confirms my
> theory about the "packed bits" being added to the 8th bit position of
> the bytes that follow. http://net.indra.com/~cliffcan/midiconv.htm
> 
> That would give me 256 possible values for that parameter. I checked
> what the range of values is for the delay time, and it shows a range of
> 30-1450ms, but I am not sure what the increments are, so I bet it works
> out. Now I just need to figure out how they map the 256 possibles to
> the available values.

Nothing is impossible. It could be in units of 2.3 msec or 1/4 notes, or 
some global tick-value, or some exponential or point-point format coded 
into 8 bits. Anything goes.

> 
> Thanks for your input. I have a feeling I will be posting here many
> more times as this project progresses! :-)
> 

 From what I read in this thread (I don't know MIDI), I also conclude
that the 8bit values are sent over a 7bit serial port. The MSB 
(top-bits) are crammed in a composite byte, which is sent before the 
seven 7bit "characters".

HTH,
AvK

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