Problems with Audio Recording

[wonder]

Nice that you solved that part for yourself

As for the main issue of this thread.
If your alsamixer first page still looks like this: http://www.subirimagenes.com/descargar.p...409&tipo=6 (btw. very bad image uploading site. Crashing my browser here and spams even with adblocking in place like crazy. Perhaps for future reference use imgur)

In the future, I use imgur

then it clearly shows that line and rear mic channels are muted (the MM means Muted both channels).
To unmute navigate with the arrow keys to the channel like line and hit m key which toggles between mute/unmute. Both channels should have green 00. After that I guess the volume is too high you can change the volume with arrow down aswell.
That should make it possible to hear everything coming from either Line or the Rear Mic.

Ouuuuu, yes!!!!!! Works!!!!
I unmute like you indicate and now, yes, I hear my external player, in my computer hear my external player
I had been looking for the problem / solution for days...thank you!

In the same line, now hear my external player but continue with distored sound or I can set max volume to 15-20%.
As it is better to see it than read it and it would be long to explain, I made a small video where you see what I indicated.

Edit: Not works the tags for youtube video or insert online video, this is the link:

https://www.youtube.com/watch?v=alGHLOQbhk4

Again, thank yoy very much!