There are definitely 2 chanter lul spells that you get within just a few levels of each other where the level limit is practically the same but the range is modified somewhat.
Calm
http://lucy.allakhazam.com/spell.html?id=47&source=Live
and Pacify
http://lucy.allakhazam.com/spell.html?id=45&source=Live
are the ones I'm referring to.
Pacify (roughly a minute) is a shorter duration than Calm (3 minutes or so), but you can get closer to a pacified mob with Pacify without getting a reaction. Contrary to popular belief Lull does not make mobs completely blind to social agro. If you path a train right over a lulled mobs head they will react. This may have changed with later expansions but back in the day it was more like an extreme line of sight limitation.
At least this is the way I have always understood it to work.
Calm
1: Frenzy Radius (5/50)
2: Reaction Radius (5/50)
3: Pacify
-------------------------------
Pacify
1: Frenzy Radius (1/55)
2: Reaction Radius (1/55)
3: Pacify
(Note: calm spell line had it's duration nerfed years after on live to be the same as that of pacify.)