Select the recording line using the MCI Mixer APIs?

I recently asked for help to record the sound from the recording devices, and I was refered to a nice program:

http://www.vbforums.com/showthread.php?t=281650

The problem is that I need to record both the microphone line, and the wave output, and the user must choose the options using Windows, this is a problem since the configuration may be lost after an OS format or something else, and he may not remember about changing the recording config again.

I've looked a bit at some code examples out there, but I haven't found something (more or less) simple that gives me the exact answer to my problem. I know both the selected devices, and their volume can be controled through APIs, but I don't know how to do it since I've never worked with sound (in any programming language I've had experience), plus the recording devices (at least their name) change varying on the sound card...

Any help??? Thanks in advance.