linuxaudio.org

just install jack packages and then go:

#jack -d alsa

to get it running
and

#qjackctl

to mannage easelly jack´s connections.
jack is an app that, amogst other things, lets you

connect any  "input(s) of your sound card/output(s) of

an running app" to any "output(s) of your sound

card/input(s) of running apps". In other words, it

does some virtual cable works at your will.
enjoy!

ref
--- Ken Schutte  wrote:
> Hi,

quoted text
>

> When I play a mono source into line-in, is there a

> way to have ALSA map

> this to left and right channels, so that it's as if

> I had a stereo

> input?  With a guitar input and wearing headphones,

> it's pretty annoying

> to hear only on the left.

>

> Thanks.

>

> 

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