Nan, I'm afraid that Trillian IRC doesn't play sounds. Ever. I've been using it for two years, and they've never had that feature. Maybe if you get the paying version, it does, but I don't know.

Laura

“Rules only make sense if they are both kept and broken. Breaking the rule is one way of observing it.”
--Thomas Moore

"Keep an open mind, I always say. Drives sensible people mad, I know, but what did we ever get from sensible people? Not poetry or art or music, that's for sure."
--Charles de Lint, Someplace to Be Flying