For CTCP, you could use:

Code:
ctcp *:*Now*Playing*:*:{
  haltdef
}


You can also try NOTICE instead of SNOTICE (more likely since SNOTICE is a server notice and isn't usually from users). For that, you have:

Code:
on ^*:NOTICE:*Now*Playing*:*:{
  haltdef
}


For SNOTICE, you'd just stick an "S" in front of NOTICE.

Invision Support
#Invision on irc.irchighway.net