LinuxQuestions.org - ALSA/Pulse - remap input to output

Hi there! I've been using Linux for about 3 years.
I have a laptop running Archlinux on which I have an jack output for headphones, a jack input for a mic/line in and an internal mic.
I'd like to remap the input jack to an output, to play sound using the original output and the mic/line in input. Now I'm using ALSA+Pulseaudio, but when I used OSS4, in the OSS control panel I had an option (a tick if I remember well) which changed the input jack operating mode. I don't know how to do this on ALSA+Pulseaudio.
The sound card is capable of doing this ( like I said, on OSS I had to tick a tick to remap the input to output).

To make this clear:
-I want to use input as output
-I don't want to touch the original output
-I want to use the original output with the new one to play audio (same channels, not necesary a virtual 4.0 sound)
-I dont' want to go back to OSS4
-The card is capable of doing this

Can you give me some advice, or a link or something?
All links I've searched over the Internet tell me how to monitor the input or how to record the input. I want to play music via input. I know I can do this. OSS4 can, so why not ALSA+Pulse?

If it helps:

Code:

00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)

Code:

snd_hda_codec_realtek    60409  1 

snd_hda_intel          24053  3 

snd_hda_codec          94305  2 snd_hda_codec_realtek,snd_hda_intel

Laptop is a Toshiba L300-1AL

Thank you.