This simple yet powerful utility behaves like a real audio cable, letting you transfer sound among applications. You can, for example, record sound from a game or from streaming Internet audio, or process the sound from one audio editor to another. The program gives you 64 virtual cables into which you can plug any application, mixing and distributing sound. (However, we should note the demo only will let you access two of them.) It even lets you make chains, connecting a whole series of software synthesizers, sound editors, sequencers, and recorders. To monitor the signal in your virtual cables, the program includes a control panel that displays the sample rate, channels, and number of connected applications. Perfectly designed for professionals, Virtual Audio Cable would be more useful for novices if it had a visual interface showing connected devices.
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From Eugene Muzychenko:
VAC is intended to connect several audio applications together in real time. It's like a sound card with hardwired input and output: when an application sends an audio stream to a virtual cable, other applications can record this stream from the other cable end. Thus, you can record and process output of almost any audio application by almost any other audio application.