5.1 sound card on front speaker !!!

hi everybody, a newbie here, just started using mint as from yesterday so im still in the air about this program,,,,,,so far im liking it but for one thing, and thats that i have a sound blaster z series and only receiving front channels, i have included alsamixer that is showing all the appropriate channels but as said on the front two are playing, all help is gratefully received many thanks beforehand.