Recording "what you hear" from your PC

Hello, I need to record some sounds, bird songs, noises etc. from internet. I use “audacity” or Wavosaur but no sound is recorded. Yamaha steinberg is the pilot. I can listen to my music on both speakers and headphones. I don’t understand where the problem is ! Thanks

Activate Loopback in dspMixFX.

Thanks ! It works !