Hallo!
> I have read various mentions to using SIMD
> instructions to speed up externals, and I have a few
> questions about this...
> 1. Where can I find the header files for this?
They are in the pd_devel branch ...
> 2. Are the instructions specific to intel hardware and
> if so is there an equivalent for Mac OS X? (I read
> something about altivec instructions ... ?)
I think Thomas implemented most of them also for osx ...
LG
Georg