How to set sound volume in LV?

LV provides us a node “SO Volume.vi” to set the sound volume of our PC, but see the result in volume control panel, it just changes the “waveform” value, my question is how to change the other values such as “volume control”,“Line in”(gain)? I think the best way is to call the Windows API, however, I don’t know which DLLs contain the functions I need, Can anyone help me? Thanks so much!

The DLL you mean is maybe MMSYSTEM.DLL

I don't know how to implement it, but I found some information from google, it may helps you.

http://support.microsoft.com/kb/118377

Thanks to you ,Yao

I've found that DLL is Winmm.dll. The functions are MixerXXX(), though I don't know how to use them, I got the direction!