I'm fairly new to Hammer (three days new, to be precise) but through online tutorials and just using it myself I have, at the very least, the basics down fairly well. However, in my first map that I intend on releasing to the public, I've finally noticed something that now bothers me to no end. Nearly every surface in my map is a concrete surface, but melee-ing them results in a metallic sound being played. This detail bothers me probably far too much than is necessary, but I'm a stickler for detail and this is a detail I will not let slide by. I came here for help since, as it turns out, a search with the words "valve" "hammer" and "fix" all in it results in a lot about plumbing and not a lot about tf2 maps. So, I must ask how can I change what sound is played when a brush/entity/et cetera is 'attacked' to better fit what the material is?