Find the application you want to isolate (e.g., Google Chrome playing music).
VAC delivers audio signals completely inside the computer. No audio hardware is required—it can even run on virtual servers without any physical sound adapter. When no format conversion or volume control is involved, the audio transfer is bit-perfect, meaning the output is an exact replica of the input—bit for bit. This makes VAC suitable for audiophile applications where sound quality cannot be compromised.
4.2 User-Space Virtual Devices (common on Linux/macOS) virtual audio cable
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VAC is developed by Eugene Muzychenko and has been a staple tool for audio engineers, streamers, developers, and hobbyists for over two decades. Find the application you want to isolate (e
One of the most innovative uses is splitting audio to multiple output devices simultaneously. VAC 4.6, for instance, breaks through Windows' native limitation of supporting only a single default playback device. It enables simultaneous, synchronized output to two separate Bluetooth headphones or multiple audio endpoints (Bluetooth A2DP adapters, USB DACs, HDMI audio, onboard sound cards) by building a programmable virtual audio bus that bypasses system restrictions.
To hear the music yourself while it routes through the virtual cable: When no format conversion or volume control is
Open your target application (e.g., OBS Studio, Audacity, or Zoom). Open the application's Audio Settings menu. Locate the setting. Select CABLE Output (VB-Audio Virtual Cable) as the device.
Internet radio stations and broadcasters use VAC to integrate multiple audio sources. For example, SAM Broadcaster users can bring in Skype calls via virtual audio cable, allowing remote guests to join live on‑air shows.