Hi Don P

I have just downloaded the manuals for both items, and you are correct, the Tyros does not have Midi Thru, (Another sign that it is just for the home player) the Roland also does not have a direct Midi Thru however it can be emulated on-board via the software (The software automatically converts the Midi Out into a Midi Thru) thus saving space.

You don’t say what Accordion you have or what Midi connections it has, however if you can give me the details, and then explain exactly what you want to do, I will see if I can work out the best way to go about it, (Although it is more difficult without the instruments in front of you) however from the details given so far you will probably need a Midi box, but as yet I am not sure what type would be best for you.

Bill