The following are all properties you can set on the lightsaber to change how it sounds
SWEP.UseSwingSound = "path to sound"
SWEP.UseLoopSound = "path to sound"
SWEP.UseOnSound = "path to sound"
SWEP.UseOffSound = "path to sound"
SWEP.BlasterBlockSounds = { "path to sound", "path to different sound" }
SWEP.BladeImpactSounds = { "path to sound", "path to different sound" }
SWEP.BladeBlockSounds = { "path to sound", "path to different sound" }
Lastly, there's a hook that controls how a lightsaber slice sounds
In case you want to disable your lightsaber sounds you can leave all of the properties as empty strings
.UseSwingSound
Finally you'll want to return true from the DoSliceSound hook above like so
hook.Add("wOS.ALCS.Lightsaber.DoSliceSound", "wos.alcs.disablelightsabersounds", function(vic, inf)
return true
end)