You could also try this
Code:
on *:text:*:#:{
  if ($chan == #chan1) && ($nick == me1) && (hello isin $1-) { splay sound35kb.wav }
  elseif ($chan == #chan1) && ($nick == me2) && (call isin $1-) { splay sound35kb.wav }
  elseif ($chan == #chan2) && ($nick == me3) && (there isin $1-) { splay sound35kb.wav }
}


I didn't test it, but it's worth a try. It should work imo.

Note: with nicknames me1 and me2, I hope it's not referring to your own nick.
This code will only trigger when someone else in the channel is saying hello, call or there.