I have coded an application to record sound from microphone, and it is not so difficult.
The next is to record directly from sound card, I haven't found any solutions yet.
It will be very kind if you suggest me some solutions.
"Starting from Windows Vista and 7 new sound API model was introduced.
There is no stereo mix or mono mix. Instead every playback device can
be opened in loopback recording mode, so you can record what you hear
from your speakers, headphones, digital output etc."