But now I've seen that Cakewalk (former SONAR) by Bandlab is free and I downloaded it and it looks pretty professional IMO. It even has a German introduction and manual. (But I didn't have any problems reading the Californian manual of REAPER, either.)
What's your experience with Cakewalk by Bandlab? Is it worth to work with it? What are the pros and cons? Should I go back to REAPER as soon as possible or dig deeper into it?