AutoNotification google calendar -- get text from note field?

The google calendar does not have a way to set a notification sound on a per-event basis. There are events I don't want to miss, so what I'd like to do is put a keyword in the Note field of the event and then use autoNotification to intercept only the calendar notifications with that word in it.
To get this working I have autoNotification intercepting all Calendar notifications. I've tried displaying the variables of the various %an* fields so that I can do further filtering but none of the fields I have found seems to hold the note contents.
Is there a way to get the note field contents? Or is there another way to intercept only certain calendar items?