Vovsoft Sound Recorder can record audio from the current input device (microphone) and from the current output device (loopback recording) by taking advantage of WASAPI.
This utility can come in handy when you are interested in quickly capturing the sounds of your microphone or the music played by your desktop or laptop computer even if you don't have any speakers connected.
You don't have to hold up a microphone to your computer's speakers to record its audio. Even if you don't have a "Stereo Mix" option on your PC, you can easily record the sound coming from your Windows PC as WAV file.
You need to follow these 3 easy steps to record the sound coming from your PC:
Step 1. Open Vovsoft Sound Recorder to record computer audio.
Step 2. Press "Start" button under the "Record loopback (system sound)" section.
Step 3. Press "Stop" button and choose the location of the wave file.
Category: Audio & Multimedia 
Audio File Recorders
Supports: 
Windows 11, Windows 10, Windows 8/8.1, Windows 7 (32-bit & 64-bit)
Language: English
License: Freeware — no nags, no ads, fully functional
Vovsoft Audio Software List Difference between Installer and Portable Editions Vovsoft Portable Software List Sound Recorder Feature Requests
Greetings from USA. Have found your tiny Sound Recorder to be quite remarkable. Since I think Windows 7 the Microsoft had removed the “stereo mix” function which allows to record from source other than the microphone. Only way around this is to download the cumbersome Audacity, and then monkey with its various settings. The tiny Vovsoft you just one click to start and stop, and the result is perfect.
— Paul and Jean
Installer
Portable
Keyboard Soundboard 
Vov Music Player