Sound - Change input line to output line

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https://bbs.archlinux.org – Hi to everyone I just have a question.It is possible to change the input line to output to have an stereo output?I use pulseaudio. My sound works great. Even when I connect earphones, the audio of my laptop speakers go off. But I have an amplifier (5.1 channels) and I want to connect my laptop to it. (I use Windows too, and it use the realtek software to change the input line to output) I'm really a total newbie with everything related to sound (I apologize for that), but I even didn't found the answer in the wiki (or there is no answer over there or I really didn't understand). (HowTos)