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
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, there could be better to try to enable it in your audio
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
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
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
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
VAC needs no hardware audio card; it is a "virtual audio card" itself.
Windows XP/2003/Vista/Win7 platforms (32-bit and 64-bit)
Local session only (not available from Remote Desktop).
Native WDM/KS audio technology.
Up 256 Virtual Cables (Windows limits number of MME devices to 32. Number
of DirectSound devices is not limited). Trial version is limited to 3
1..20 milliseconds per interrupt.
1..100 pin instances.
Almost any of fixed point PCM audio formats (200..1000000 samples per
second, 8..32 bits per sample, 1..8 channels). Floating point formats are
Almost no sound latency with maximal interrupt frequency.
Unlimited number of clients connected to each port.
Signal mixing (with saturation) between output port clients.
PCM format conversion.
Volume control features.
Control Panel application to dynamically configure cables.
Audio Repeater application that transfers from any Wave In to any Wave Out
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