I cannot find avssamp in GraphEdit.

I am currently developing drivers using avshws and avssamp.
avshws can be found in graphedit after building and installing.
But avssamp was installed successfully using devcon but can not find in graphedit.
Please help me.

Did you check the source code at all? Avssamp has both a video pin and an audio pin. The audio pin reads from a file called c:\avssamp.wav. If that file is not present, the audio pin creation fails, and the filter will not be registered.