Well the namco arcade sound chip isn't emulated yet(and never will be unless somone finds info on it), so ALL namco 3d arcade games lack sound at this point. I think that's the biggest reason, although dancing eyes just got into mame (sans sound) which runs on the same hardware as tekken/tekken2. A person should also note that it runs at about 1/6th the speed it does on zinc, so it's kind of like crusin being added. It's in there, but next to no-one can actually play it.