Virtual Audio Cable

Latest version: 4.50new


Virtual Audio Cable software allows you to transfer audio (wave) streams between applications and/or devices.

It creates a set of virtual audio devices named "Virtual Cables", each of them consists of a pair of the waveform input/output devices. Any application can send audio stream to an output side of a cable, and any other application can receive this stream from an input side. All transfers are made digitally, providing NO sound quality loss (a bitperfect streaming).

VAC behavior is similar to "What You Hear" (or "What U Hear", "Stereo Mix") feature of Sound Blaster Live! and Audigy cards. But it is only similar, not equivalent. If you simply need a function like "Stereo Mix" under Vista/Win7/Win8, there could be better to try to enable it in your audio adapter.

If more than one applications are sending audio to Virtual Cable device, VAC mixes all streams together. If more than one applications are receiving audio from Virtual Cable device, VAC distributes the same audio data among all targets.

VAC is useful to record application's audio output in real time (audio player, instant messenger or software synthesizer), or transfer a sound stream to another application processing it. You can, for example, use two or more software audio players/generators/synthesizers/sequencers to produce audio streams, sending them to Virtual Cablet device and record a mixed stream from the same Virtual Cable device, using any recording software - Windows Sound Recorder, Audacity, Sound Forge, WaveLab, Adobe Audition (formerly Cool Edit Pro), Gold Wave, Cakewalk/Sonar, Cubase/Nuendo etc.

With an ASIO wrapper like ASIO4ALL from Michael Tippach, you can use VAC in ASIO supporting applications.

If you use an audio encoder application that encodes a stream coming from a sound card, you can use VAC to supply such encoder with a stream produced by other application.

You can use VAC to capture an output sound stream from the application that doesn't allow to write it into WAV file directly. Unlike Total Recorder allowing you to simply save audio stream, VAC allows to route it in real time.

If you are using some Voice Over IP (VoIP) and/or Internet Telephony applications like Skype, you can use VAC to record your calls and conversations.

VAC needs no hardware audio card; it is a "virtual audio card" itself.

A detailed description is included into a free trial package.

Since VAC 4 is a WDM driver, there are some benefits but some (generally older) applications that use MME (waveIn/waveOut) interface can work better with the older VAC 3 version. This version also supports Windows 98/ME.

If you need to simply share your In/Out wave ports among several applications under Windows 2000 and earlier Windows versions, take a look to the Wave Clone software.

Important notes

Please note that VAC is not a self-sufficient software that may work alone just under operating system control. VAC is a tool. Like hardware tools (for example, a screwdriver or a saw) that are used only together with other objects (screws or boards), VAC should be used only together with audio applications to route audio streams produced or consumed by these applications.


System requirements

Trial version limitations

Trial version the following limitations:

In other features and characteristics, trial version is identical to full version.

Download and purchase

VAC is distributed in two different forms:

Buy online ($25-$50, please pay attention to technical support levels)

Caution: please evaluate trial version before purchasing the full version to ensure that VAC works properly in your system and satisfies your needs.

Registered VAC 3 users who bought it from this site (not from other distributors) can purchase VAC 4 with 50% discount. To do that, please contact the author for a discount link.

People living in Russia can purchase VAC 4 for non-commercial usage with 33% discount. To do that, please contact the author for a discount link.

How to install

VAC package is distributed as a ZIP archive. Simply unpack it into an empty folder, run setup.exe application and follow the instructions displayed. If you use VAC for the first time, please read the readme.txt and vac.chm files before installation. If you have already installed previous version of VAC 4, don't forget to uninstall it before installation.

How to upgrade/downgrade

Registered VAC 4 users can freely obtain bugfixed versions as described in the order confirmation email message.

To download a distribution package of full version with a given number, simply replace version number in your private download URL provided in the "Thank you" message. This message will be provided two ways: on the final order page and in the order confirmation email message. For example, if you have purchased 4.15 and want to download full version of 4.50, just replace "415" in the private URL to "450".


If you have experienced problems with VAC, first please try to find an answer in its user manual. If your issue is not covered by the manual, please ask for support. See the Support chapter in the Manual for the request format guidelines.

Only English and Russian languages are supported in communication.

Support requests are usually processed within 2-3 business days.

Please don't confuse between support and teaching. The support is provided to solve technical problems and unexpected behavior issues. Questions like "I want to use VAC to ..., please provide an exact setup for this configuration" are considered annoying.

In general, it is impolite to ask for support without reading the user manual first.

Release history

Version 4.50 (30.12.17)

Version 4.15 (31.12.15)

Version 4.14 (30.05.14)

Version 4.13 (23.07.13)

Version 4.12 (01.04.12)

Version 4.11 (11.03.12)

Version 4.10 (15.02.10)

Version 4.09 (11.06.08)

Version 4.08 (14.09.07)

Version 4.07 (28.06.07)

Version 4.06 (15.05.07)

Version 4.05 (12.05.07)

Version 4.04 (31.12.06)

Version 4.03 (16.07.06)

Version 4.02 (22.05.06)

Version 4.01 (24.03.06)

Version 4.00 final release (06.03.06)

Version 4.00 beta 6 (27.02.06)

Version 4.00 beta 5 (16.12.05)

Version 4.00 beta 4 (18.08.05)

Version 4.00 beta 3 (23.07.05)

Version 4.00 beta 2 (15.07.05)

Version 4.00 beta 1 (07.06.05)

Become an affiliate

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Register now!

Source code and other options

VAC is a WDM driver miniport written entirely in MS C++ using object-oriented technology. No external assembly files or additional driver development tools like VtoolsD are used.

VAC also supports a custom (proprietary) version creation to be used together with a particular application only. Each of custom versions has an unique key to identify its "native" application. This "native" application uses a special way to open the driver. Such opening way is called a "open in the native mode". When the driver is opened in native mode, it transfers audio signal without any limitations.. If not, it adds a noise to the signal to prevent unauthorized usage.

Please note that custom version of VAC has the same functionality as the common version. Customization includes only unique names and unique key, not additional custom functionality.

To order VAC sources or a custom version, please contact the author.

Other software from me

If you want to explore my other projects, please visit Eugene Muzychenko Software Homepage.