[sdiy] Midi problems

[Paul Maddox]

Tim,

> So like, how is poly supposed to work?

not to hard to work out..
assuming you're useing running status..
pressing a chord would be

0x90 0x60 0x7f 0x63 ox7e 0x68 0x7f

This is note on and I think C minor,  so its not so bad..
simple trick, if the MSB is set, REMEMBER the byte (call it running_status)
if you get ANY other byte with the MSB set, forget the running_status byte
as the data that follows is for some other channel.
I use a counter.. so for example, after getting a note ON command thats on
MY channel, I set a counter to one...
if the counter is one, then the next byte must be note data I then set it to
TWO, next byte that arrives should be velocity I then set it back to 1.
If a Note on for another channel (or any byte with MSB set that I dont care
about) arrives then set the counter to 0
and you're off...
watch out for CLOCK data though :-) it can arrive at ANY point.. so if you
dont plan on useing it make sure you have a filter setup, so if midi clock
arrives it simply gets ignored and nothing is done with it (dont change the
counter value either!)

> PS I'm beginning to think midi SUCKS!

it doesnt suck...
Its just awkward to use :-)

Paul
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