Different people have tried this in different ways. For me, configuring ALSA to capture from the "Mix" device didn't work since I don't have a "Mix" listed when I try the amixer command. I could however write the ALSA output to a file by configuring the PCM chain.

Have the following code in your ~/.asoundrc file:

It is extremely easy to get a tiny little keyboard to generate melody in your Linux box. In fact, you can play hundreds of instruments. Here’s how I did it in my Fedora Core 6 and 7 laptops: