Redirect output sound to input (mic or line-in)
I want to compare the quality of a sound file (voice) before and after its transmission via a softphone (sjphone in my case).
For this, i need to redirect the sound played, to the sound input (microphone or line-in).
Some people proposed me to use aslamixer, aumix, arecord, ... but I didn't undertood how to use them.
Can you please tell me how can I do this ?
Hope I was clear.
Thank you in advance.