You might try using the ON NOTICE event, rather than ON SNOTICE.. read /help ON NOTICE for the correct format..it's slightly different to that of ON SNOTICE.
That didn't do it, either. And when I use the On Notice like this:
on 1:NOTICE:*:?:{
echo -a $1-
halt
}
I don't see notices at all. Forgive my ignorance.