games-sports/racer-bin compiles and runs on adm64, it has however two dependencies, One is lib-fmod, but obviously it compiles the amd64 bits version, which can't be used with the 32 bit binary. Result == no sound. If we can get the lib-fmod to be compiled in both 32 and 64 bits, (and linked correctly) sound should work.
fmod is pretty specific ... adding it to the emul libs doesnt gain much
ill ask the author of racer to provide a 64 bits racer bin instead. That would also solve the problem. No idea if he has actually made any progress towards 64 bits though.