Hi Jim

I do not fully understand the question, as the sequence tempo (Including Start/Stop) is controlled via the Midi Clock and is stored automatically in the Midi file header when you save it. (This is why when you load in a Midi file the tempo is always set)

The only time you need to worry about it, is when you are using multiple sequences, as you have to choose which provides master control. (It has been part of the Midi spec since it came out in 1983, so is as common as note on/off)

NOTE: if it is just a tempo commands you wish to send (For a style perhaps) then just turn off the other Midi commands. (This will also be stored in the Midi file when saved) Unless Yamaha has its own unique commands, it will work with any Midi based equipment. (A style is just made up of Midi loops)

If you are still not sure, this Midi Basics article should help Midi Basics (Link is to part 2 however it is worthwhile reading all of it if you want to fully understand Midi)

Hope this helps

Bill