How does Win7 open a stereo mix through the registry?

Many users of Win7 systems use the recording function. The recording is only monotonous when the sound is only sound. Usually we add background music and then output the recorded sound and music at the same time. But if you don't see the "Stereo Mix" option in the Win7 system, what should you do? Let's follow the small series to see how to open the stereo mix through the registry.
1. Click "Start"->"Run" Enter "REGEDIT" Run Registry Editor.

2. After the Registry Editor appears, locate the following path HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Class\\0005\\Settings\\filter\\Rear or directly locate it by looking for “EnableInputMonitor” Under the folder. It is recommended to look directly, one by one, although it is troublesome, because letting the computer search for itself is too slow.

3. Create two new binary values ​​under this folder: Named ”DigitalinputMonitor”, “DigitalStereoMix”. The data of both key values ​​is set to 1. Right click on the data area on the right, create a new - binary value, then right click on the new item, change the data value, enter 01 directly, the previous row of 0 is ignored.

4. Close the Registry Editor and restart your computer.
The recording control also has an option "Stereo Mix", so that it can be recorded directly, of course, the mixing function can also be realized.
In addition, in the "volume control", there is an additional item "Input Monitor", which can realize real-time playback of the MIC, and the volume can be adjusted.
Why is the Win7 stereo mix gone? In fact, many times it is due to the lack of function caused by some optimization software, and through the above registry method, we can re-call the stereo mix of Win7. Although a bit complicated, patient operation can be successful.