Hello Jorgen --
Welcome to the forum!
This is the best place to find tutorial information (in English). In case you haven't already done so, please browse through the PSR Tutorial main page:
https://www.psrtutorial.com/You'll find sections and links dealing with use, etc. The forum is a terrific community and is quite civil by Web standards. There are many knowledgeable people here and each seems to have their own area of specialization.
There are a few other worthy sites on the Web. If you're a German language speaker, then try Heidrun's Soundwonderland:
https://www.youtube.com/user/SoundWonderlandAll the best to you -- pj
P.S. Several forum members are also Motif, Montage, MODX, MOX players, too. (Myself included.)