Creating a new soundset

[DarthStevenus]

I'm trying to create a custom soundset for a door in my map, because I can't find a default one that sounds right. I added this to the bottom of sound.txt:

;*********************
;ds_door_custom_large
;*********************
bmodelSet ds_door_custom_large
subWaves movers/doors door_stone_start door_huge_move_lp door_stone_stop door_stone_start door_stone_stop

 But I get an error about missing soundsets when I try to start the map. Is there something else I need to do to add a new soundset?