Is it also possible to write own externals with C++ instead of with C? If yes can someone point to some tutorials?

Thanks

It is possible (AFAIK).
For instance, it is used here < https://github.com/CICM/CreamLibrary >.
The FLEXT wrapper < https://github.com/grrrr/flext > is another example.
Sadly, I'm not aware of a step by step tutorial.

< http://forum.pdpatchrepo.info/topic/9910/pd-cannot-load-external >