play sound script

[pete mac]

entourage 2004 OSX10.1.4

the following script no longer works with play sound 1.6

set cusrPath to (path to "cusr" as string)
set soundAlias to (cusrPath & "Documents:Microsoft User Data:Custom
Sounds:katehello.aiff") as alias

tell application "Play Sound"
«event µMCSplay» (soundAlias as alias)
end tell

the error says that «event µMCSplay» is not recognised

can anyone suggest a script which will simply play a sound [for use with
rules to help signify sender of incoming mail, etc]

thanks

pete