//splashes (duped from Heretic and Hexen, since they don't load in Doom natively by default)
world/drip gloop
world/watersplash gloop
world/lavasizzle acid5
world/sludgegloop muck5
//you can override the limit values so multiple splashes can play simultaneously
//note that this sounds bad if multiple splashes play all at once (such as when firing a shotgun into liquid), so override these values at your own discretion
$Limit world/drip 4
$Limit world/watersplash 4
$Limit world/lavasizzle 4
$Limit world/sludgegloop 4