Features

• Works in Windows 11, 10, 8.1, 8, 7, Vista and XP desktop and server OSes.
• Supports 32-bit (x86) and 64-bit (x64/ARM64) CPU architectures.
• Up to 256 virtual cable devices (some systems limit number of MME devices).
• 1..20 milliseconds per processing event (nterrupt).
• 1..100 pin instances.
• Almost any of fixed point PCM audio formats (1000..384000 samples per second, 8..32 bits per sample, 1..32 channels). Floating point formats are not supported. If you want to use more than 8 channels, please read about compatibility issues.
• Almost no sound latency with maximal interrupt frequency.
• RT Audio support with notification events, packet mode, clock and position registers. Clock registers are bound to Virtual Cables so all streams in each cable are coherent.
• Unlimited number of Kernel Streaming clients connected to each pin.
• Signal mixing (with saturation) between output pin clients.
• PCM format conversion (sampling rate, bits per sample, number of channels).
• Volume control features (both attenuation and boost).
• Clock correction features to reduce or totally eliminate clock rate difference effects.
• Channel scattering/gathering mode (channel remapping).
• Control Panel application to configure cables and watch their state.
• Audio Repeater application that transfers from any recording to any playback device.

Compatibility issues

There are some compatibility issues preventing VAC from working correctly in particular cases and/or configurations.

New Windows versions

This product is designed to support as many Windows versions as possible. If a new Windows version is released after releasing last version of the product, the product most likely supports it. Just download free trial version and try.

Free version limitations

Free Lite version may be suitable for simplest audio routing schemes.

• Supports only a single cable.
• Maximum sampling rate is 48000.
• Maximum bits per sample is 16.
• Maximum number of channels is 2.
• Minimum milliseconds per event is 3.
• No multi-client support (only a single pin instance and a single stream at each cable side).
• No worker thread control support (only a single worker thread with default priority).
• No stream format limiting control support (only Cable Range mode).
• No channel mixing mode control (channel remap/scatter/gather operations are not supported).
• No source line control support (no Mic and S/PDIF lines, only Line In).
• No position and clock register support.

Trial version limitations

Trial version supports all the features available in full version, except the following:

• A female voice repeatedly reminds that this is a trial.

Trial version of VAC allow you to see all features of the full version. To prevent professional usage, it adds a voice reminder (-6 dB level) to an audio signal. Voice reminder is not applied 30 minutes since driver startup (Windows boot or VAC driver restart without rebooting the system), then it is applied at a regular basis, every several seconds. If you need additional several 30 reminder-free minutes to perform some testing, restart the driver and run your tests immediately. Before driver restart, you need to close all applications that may work with audio endpoints (including web browsers), and launch them again after restarting the driver.

Please note that voice reminder is just added to Virtual Cable audio signals, not replaces them. If you are recording from a Virtual Cable and hear nothing except voice reminder, it definitely means there is no useful signal in the cable because it is not supplied with a signal, and you should check audio application's settings. Vice versa, if you have installed trial version, recorded from a Virtual Cable when voice reminder is audible, but there is no reminder in the recording results, it definitely means that you have recorded from a wrong endpoint, not from a Virtual Cable.