Please help with programming in ALSA

Hi,
I am trying to make the configuration of some sound applications I have written easier, but I am getting lost in the very sparse documentation of the ALSA API. What I am trying to do is to get my apps (for ham radio digital modes) to set up the sound card for capture, but I just can't figure out what mixer functions to use to specify capture source. amixer gives me the following info on the capture source I want to use:
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 46
Front Left: Capture 46 [100%] [30.00dB] [on]
Front Right: Capture 46 [100%] [30.00dB] [on]
Simple mixer control 'Input Source',0
Capabilities: cenum
Items: 'Rear Mic' 'Front Mic' 'Line'
Item0: 'Rear Mic'
My problem is how to specify 'Capture'/'Input Source'/'Line' as the input source of the audio from the receiver, so that the signal can be decoded. I have code to specify 'Capture' as the capture source, but how to I select 'Input Source'/'Line' specifically? So far I use xfce4-mixer to do this, but trying to understand its source code is as hard as understanding the ALSA API.
Any hints gretefully welcome ......

I now use the borland compiler, after I had trouble with DJGPP. And I integrated it into a my favorite editor.
The editor I use is [url http://home.t-online.de/home/Jens.Altmann/jfe_eng.htm]JFE, you can set up "Tools" (compilers, etc), syntax coloring, auto-indent, line numbers, and it will recognize the syntax of error messages from certain compilers, enabling you to double-click the error to go straight there.
Cheers,
Radish21

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