Russell McMahon wrote:

>>I need to communicate via MIDI both with a PIC and with other MIDI 
>>devices
 
>> Some sites hint that an error of up to 3% is OK

> With stop bit that's 50/(1+8+1) = 5%
> That's the error at BOTH ends.

> If it's not an async serial protocol then the above doesn't apply :-)

It is an async serial protocol, and it applies. All MIDI devices that I've
seen from the inside use standard UARTs to communicate. The only thing a
bit odd about it is the bit rate. 

So you are probably quite safe with 1.7%, and the sources that say up to 3%
are fine are correct, too. (No hard experience data, though.)

Gerhard
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