I 'm searching documentation about filtergraph~ in pd...

The use of this objet seems more different of the max's object (no float...), and I didn't find his source !

What is the package that include filtergraph ?!...

(I work with the "big" version of pd: PureData-0.37-2003.10.19.exe which include a lot of packages, and I can't find from where filtegraph is !!!)

If anyone can help me !

Thanks !