I try to copy a part of a clip A, which has been cut into 2 pieces: A1 and A2. They are both "audio clips". A1 is laughing, A2 is talking. I try to copy A1 several times, then to put several A1's the one behind the other, so that there is a long laughing. I thought I can activate A1 (in audio2), then go to "copy", then to "paste". Before copying I set the time-indicator exactly at the end of A1, but after pasting I cannot find a copy of A1 anywhere. What do I do wrong?