The SME3.0 demo's do that and more... I don't know about all the demo's, but there's at least one that uses those chips plus the MSX-AUDIO at the same time...
It wasn't that popular however .. ppl *might* need to have 3 cart.slots, and not everyone had a slotexp or 2+/tR with msx-music.
Limited choice in musicprograms was also a factor ..