Guys, adding SCC support while not having the chip itself in the ROM, meaning you have to add some kind of SCC with switch in a second slot (because you cannot put that in a 64K cart that is full) looks kind of shabby and cheap.
I mean: you will ofcourse get in-game music when you don't have any sound expansion, but it will sound a whole lot better if you have an MSX-Music expansion.
I cannot 100% guarantee at this point that FM will be supported, because the drivers are still under construction, but it is an idea.
And yes, giangiacomo.zaffini, it's the same thing. 
Most of the users will allready have SCC, either the original one or these FPGA based found in varius SCC SD/ROM / PLAYSONIQ...
So I don't see why it has to be fm over scc 
. SCC just has the right sharp sound for such games .
There should be greater amount of MSX1 users with SCC than FM-PAC. Almost none pure MSX1 games supported msx-music.
As this is added value to the cartridge and not a requirement to enjoy the game there should be no problem that the scc is not present in the game cartridge.
So I don't see why it has to be fm over scc
Maybe because I am the musician that's supposed to make all that stuff and I happen to like to work with FM more than I do with SCC. 
*teehee*
Haha, I kid. Nothing is even certain yet, so all of this is merely speculation, and nothing more.