Locate AU component (Audio Unit)

I have been trying to locate the AUPitch component in TIGER for testing in an earlier OSX version. The AU plugin appears in suitable applications but I cannot find it in the components folders in PLUGINS under audio in either the home or user folders. Any ideas where it is???

confusing. I suspect it may be PART of another APPLE AU, but what is that called, in that case?

cheers
BERT in Sweden