launch the supercollider application and type MaxPat. Double click it and then press cmd+Y. You should see that the class file pops up. That means that your class was correctly loaded so it is 'recognized' by the program. If not, please check that your extensions folder is on the correct search path. You can also place the class on the main sc folder, on the SCClassLibrary. If you still have problems, please copy+paste here what the post window yields so I can take a look.

Emmanuel

Thanks a lot Emmanuel

I figure it out in the meantime.

What i did wrong was that I didn't load the MaxPat folder in the extensions but the MaxPat file.

I was then able to open the MaxPat.html

And from there by scrolling down

I saw the

Patch conversion examples (max5 to max4)

//simple example - convert and save on the desktop a= MaxPat.read("/Applications/Max5/examples/max-tricks/buttonflower.maxpat"); a.saveAsMax4("~/Desktop/buttonflower.pat");

And tested each line by pressing (enter)

and voilà! it worked.

hope this post will help others

thanks again Emmanuel , I will still try you cmd+Y method.

phil