I'm not sure about PT, but think about it...You want just the silibance, so find it with an equalizer. You still want the dry signal, so you make the EQ'd silibance experiment it's own track. You wan't delay, well, there you go. It will be helpful as well to put the dry signal @ 0% so that those (what are usually painful) silibants don't double up on you.

Brian Trudeau is also very good at this, it allows for rhythmic tangents without straying too far from the material.

most de-esser plugs have a monitor function (you just hear the sss part), send that to a delay/verb..

In Pro Tools doesn't the Lexiverb plug do that?

Why don't you just try to record the main vox without the sibilance and then come back and rerecord just the sibilant parts and add either reverb with a long decay or a delay.

thanks guys. i knew it was a silly question and i kept on trying a bunch of sidechain stuff and was always getting doubling of my sibilant parts when copying and EQ'ing a track... your comments should help.

i don't have the LexiVerb plug, but I'll check my other verb plugs...