Note that keeping the music in sync on the second calc would be virtually impossible. Each calc got different processor speed. For example my TI-84+ might run at 15.00001 MHz while yours might run at 15.2837872 MHz. Music would always get out of sync in a way or another. To remain in sync, both calcs would haev to be linked together so that the calc playing the game would send a byte to the second one telling it when it's done with one note and to play the next one. That migth end up being a bit slow, though.

Well could you demonstrate how? It migth not be easy for everyone if they didn't figure out yet. Also the problem is that with music on-calc, it slows games down a lot, since everything stops while the music plays. If you want faster speed, you usually lose considerable amount of quality through the music, to the point where it sounds like a poorly tuned radio station.

It doesn't because he said in one of the earlier posts he had no plan to add sound. And now it's discontinued so yeah

Well could you demonstrate how? It migth not be easy for everyone if they didn't figure out yet. Also the problem is that with music on-calc, it slows games down a lot, since everything stops while the music plays. If you want faster speed, you usually lose considerable amount of quality through the music, to the point where it sounds like a poorly tuned radio station.

Link to the video I use it for soundeffects, but midi is the same principle.
I discuss the problem you mentioned too.