I didn't imply Creative make it. Exactly the other way around. Isn't there anyone interested in such mixer in the whole community? GAMIX is excellent mixer, for example, but it shows rather PURE REGISTERS and lets you experiment with them. Why not make a normal GUI like the GUI of Creative? TASKS instead of REGISTERS? "Output to headphones", "Output to front speakers", "Output to front and rear speakers", "Output to 5.1 if the card supports it"? AFAIU, all the registers are known, there should not be a big problem to make some normal GUI.
BTW, there used to be some GUI like that - for ALSA 0.5. It doesn't compile with ALSA 0.9.