Thank you very much for your answer. I try to describe my "problem" again.
For example: I do a recording from bar 3 to bar 7. L locator set to bar 3, R locator set to bar 7.
Now I want to correct only bar 5. L locator set to bar 5, R locator set to bar 6. Punch in and out.
Now when I have recorded bar 5 again, I hear the old recording AND the new recording in bar 5.
The old recording in bar 5 was not replaced by the new one. That is my problem.
Sorry for my english - I hope you understand my question. Thank you!
iMac 3.1 GHz Intel Core i7, OS X 10.8.5
Cubase 6.5.5 und 7.5.2