Virtual Audio Cable

Virtual Audio Cable is a Windows WDM multimedia driver that allows a user to transfer audio streams from one application to another. Any application is able to send an audio stream to the output side of a "virtual cable" while a corresponding application can receive this stream from the input side. Since all transfers are made digitally there is absolutely no loss in sound quality. VAC is a "Wave-Version" of a "MIDI Loopback Cable" such as MultiMid or Hubi. The latest package, VAC 4, includes a 32-Bit and 64-Bit Windows Vista compatible version along with the previous Windows 2000/XP/2003.

VAC is written entirely in C++ using object-oriented technology. No assembly files or additional driver development tools like VtoolsD are used. Windows 98/ME/2000/XP versions consist of user-mode and kernel-mode components which are compiled from a single source file set.

VAC is unique in that if more than one application is sending audio through an output virtual cable, it is able to mix all of the streams together or create separate corresponding virtual input cables. Similarly, more than one application is able to receive audio from an input cable, whether it's sharing the same audio data with another target or receiving its own personal audio stream. VAC is extremely useful for recording an application's audio output in real time or transferring a sound stream to another application so it may process it. A person could use two or more software audio generators/synthesizers/sequencers to produce audio streams and send them to a VAC output cable and record the mixed stream from the VAC input cable using any type of recording software.

Due to the fact VAC routes audio streams in real time it is able to be utilized in various unique manners. A person is capable of using VAC to 'steal' an output audio stream from an application that normally does not allow files to be written into WAV. A user could also manipulate VAC into recording conversations through Voice Over IP (VoIP) or Internet Telephony applications such as Skype.

Features

• Windows 2000/XP/2003/Vista platforms (32-Bit and 64-Bit)
• Native WDM/KS audio technology
• Up 256 Virtual Cables (Windows limits the number of Multimedia Extensions devices to 32)
• 1..20 milliseconds per interrupt
• 1..100 pin instances
• Supports almost any of fixed point PCM audio formats (Floating point formats are not supported)
• No sound latency with maximal interrupt frequency
• Unlimited number of clients connected to each port
• Signal mixing between output port clients
• PCM format conversion
• Volume control features
• Control Panel application to dynamically configure cables

Release History

VAC 3

• Version 3.00 – June 11, 2002
• Version 3.01 – June 20, 2002
• Version 3.02 – July 2, 2002
• Version 3.03 – July 7, 2002
• Version 3.04 – October 28, 2002
• Version 3.05 – February 26, 2003
• Version 3.06 – May 11, 2003
• Version 3.07 – March 16, 2005
• Version 3.08 – March 18, 2005
• Version 3.09 – June 6, 2005
• Version 3.10 – July 14, 2005
• Version 3.11 – December 2, 2005
• Version 3.12 – January 9, 2006

VAC 4

• Version 4.00 – March 5, 2006
• Version 4.01 – March 24, 2006
• Version 4.02 – May 22, 2006
• Version 4.03 – July 16, 2006
• Version 4.04 – December 31, 2006
• Version 4.05 – May 12, 2007
• Version 4.06 – May 15, 2007
• Version 4.07 – June 28, 2007
• Version 4.08 – September 14, 2007
• Version 4.09 – June 11, 2008

References

1. ^ ^{a b} http://www.ntonyx.com/vac.htm
2. ^ http://software.muzychenko.net/eng/vac.html
3. ^ ^{a b} http://www.screenvirtuoso.com/vac.html
4. ^ http://www.jasminemusic.com/vac.htm
5. ^ http://www.software-dungeon.co.uk/software.php?id=109133
6. ^ http://www.softpedia.com/get/Multimedia/Audio/Other-AUDIO-Tools/Virtual-Audio-Cable.shtml

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