They ALL do... the problem is, they are ALL different, and they are ALL unchangeable. Yamaha uses PC#'s, Roland uses PC#'s, not sure what Korg uses... But Yamaha's PC#'s are different to Roland's, and you can't change them yourself so they match.

That is all we need... (and a simple parameter would enable/disable reception).

It's not rocket science, simply apathy from users who would LIKE to maybe run two arrangers, but can't be bothered to let their manufacturers know that this NEEDS to be fixed before it is possible. The thing that blows my mind is, how come the arranger manufacturers don't realize that this one thing would do more to increase sales than just about anything else they can think of. If I COULD run two arrangers together, I guarantee I WOULD. So would many here. But until this happens, we usually stick to just the one.

All it would take would be a phone call from Yamaha to Roland and Korg, and it become the de facto standard (everybody else would jump on board). But they won't do it until you tell them that you WANT IT...