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Just an FYI, but I was looking for the same thing this weekend (how to do sounds) and apparently it's dependent on your version of Mudlet. According to the Mudlet forums, there's an issue with one of the libraries used in the current version (think it's still 3.0.0-delta?) and sounds won't play without some fairly complicated workarounds.It's expected to be fixed in the next release, I think.