When you want to connect the audio output from your smartphone to your home stereo system, you may need an audio cable with 3.5mm audio jacks on both ends. Just like an audio cable is used to feed the output of one device to the input of another, you can use Virtual Audio Cable to feed the audio streams of one application to another in Windows.
Virtual Audio Cable installs a virtual audio device driver in your Windows PC that can be used to both receive and send the audio streams. It appears as the Line 1 in the control panel of both the Recording and Playback device properties. You have to set these Line1 devices as default for them to work with Virtual Audio Cable.
After this is done, you can use Audio Repeater to direct the audio output of one application to another. In the Audio Repeater window, you can select the input device in “Wave In” and output device in “Wave Out” and then click on the “Start” button. This will instantly start sending the audio stream from “Wave In” to “Wave Out”. In Audio Repeater, you can also choose some options to select buffer, resync, sampling, and channels.
Virtual Audio Cable is useful when you want to record the audio output of an application without any interference from any other application or the operating system itself. For example, if you want to record a Skype call, then you can set Skype as input and virtual recording device (Line 1) as output in Audio Repeater. Then you can record Line 1 using any audio recording application like Audacity. If you also want to hear the Skype call, then you can use a second instance of Audio Repeater to set the same stream to output to the computer’s speakers or headphones
You can download Virtual Audio Cable from https://vac.muzychenko.net/en/index.htm.