[sdiy] Communications with voices in a polyphonic synth

[MTG]

I"m pretty sure you could do a 485 protocol with no transceivers if you 
wanted. Simply go open-collector (open drain). That's basically the physical 
layer of I2C. Either one can be driven great distances by adding 
transcievers/buffering/etc.  Inside the same box you won't likely need any, 
though slew-rate limiting can save you noise problems down the road.

For me this type of decision comes down to what peripherals do I have access 
to (UART vs I2C) and what speed do I really need.  I don't think either are 
going to be screaming fast and it's pretty rare that you need screaming fast 
(at least with the kind of stuff I do which is human-machine interaction ... 
damn human is so slow).

I think any flavour of CAN is overkill just like TCP/IP would be. Ditto for 
I2S unless you have a spare I2S port in your micro.  What micro is this 
again?

GB