Q 01: I've set output of my sound program to VAC Out, and there are no sound. Why?
A 01: If you connect sound source to one side of the cable and leave other side unconnected, you will not hear any sound. You need to connect other (In) side of the cable to any other application that will receive sound coming from source app. See the VAC principles for details.

Q 02: I've set output of my sound program to VAC Out, then set input of recording application to VAC In. Sound records fine but I hear silence only from my phones/speakers. What can I do to hear a sound?
A 02: To monitor audio signal transferred through the virtual cable, you can use VAC multi-client feature that allows you to connect multiple audio destination apps to single VAC port. The simplest way to monitor is using Audio Repeater app, coming in VAC package. Assign Audio Repeater In to VAC In, assign Out to your sound card Out, and start transfer. Then you will hear all sounds that comes through this virtual cable. If you experienced periodical clicks and pops, try to place the cable in the synchronous mode.

Q 03: Can VAC render my MIDI sequence to a Wave file?
A 03: Definitely, no. VAC simulates a simple electric cable, it can't synthesize sound from MIDI sequence. Although, VAC can help you to record output of some software synthesizers to a Wave file.

Q 04: Why VAC doesn't route output of Roland VSC-xx, Yamaha S-YXGxx?
A 04: VAC simulates plain MME Wave device, which has Wave In and Wave Out ports. If application allows to explicitly assign its output to given Out port, then this port can be VAC's. Some apps and many soft synths implicitly routes its output to preferred system Wave/DirectSound Out port; in most cases it is a hardware sound card. Try to set the preferred system audio playback device (Control Panel -> Multimedia -> Audio) to the VAC Out port.

Q 05: Can VAC route sound between different PC's?
A 05: No. Maybe other app or driver will be created later for this purpose.

Q 06: I started wave record, then run Cakewalk but there are no Virtual Cables in Cakewalk port list.
A 06: Cakewalk behaves slightly strange, querying audio devices upon startup only. During them, Cakewalk queries wave devices whether they support various audio formats or not. If wave device doesn't support particular format, Cakewalk excludes it from available wave ports. If any activity (record or play) is present for particular Virtual Cable, its format is fixed and any other formats will be rejected. Thus, stop all activities for that cable, start Cakewalk, and then restart play/record again.

Q 07: I'm using Audio Repeater to monitor one of VAC cables with my soundcard and there are some interrupts of the sound. What's incorrect?
A 07: Maybe you're using the cable in asynchronous mode. Try to switch it to synchronous.

Q 08: Why Cubase's ASIO Multimedia Control Panel cannot determine optimal buffer size under Win9x?
A 08: VAC's VxD uses "application time event" technique to notify the application that current sound buffer processing is finished. Cubase buffer size detection algorithm disables task switching and application time events. There is no way to correct this situation.

Q 09: How much is sound latency with VAC?
A 09: VAC itself adds almost no latency; actual value is more dependent from application sound buffer size, than from VAC interrupt frequency. For example, if interrupt frequency is 100 (10 ms per interrupt) and the application uses two buffers of 100 ms each, the maximal final latency will be 100 * 2 + 10 = 210 ms. To reduce latency, try to increase interrupt frequency, decreasing total sound buffer size.

Q 10: I've tried the demo version and then bought the full version. But installation of the full version was failed.
A 10: Maybe you forgot to uninstall the previous (demo) version of VAC. Uninstall all VAC versions and carefully follow installation instructions.

Q 11: I've tried to use DirectSound output in synchronous mode but there are some misses in the audio stream. What is happen?
A 11: It can appear due to DirectSound synchronization loss.

Q 12: I've tried the demo version of VAC and can't get it to work for my application. If I'll buy the full version, will it work?
A 12: The full version of VAC differs from the demo only by allowed number of cables. The full version also doesn't spoil audio data after three minutes of work. Therefore, the demo version has all of the full version features and can do all the full version do. If you can't get the demo work for you, maybe you are doing something wrong or VAC isn't intended to your application at all.

Q 13: I've purchased VAC and want to use it with GigaStudio. But GigaStudio shows only one cable in its menu. How to see all other cables?
A 13: GigaSampler/GigaStudio have a very strange behavior in relation to Wave devices. For example, they don't show the Creative SoundBlaster 32 devices at all. With VAC, they show only the first Virtual Cable device. NemeSys documentation says nothing about that. Try to route this question to NemeSys support team.

Q 14: I have two audio adapters with their own speakers attached. Can I use VAC to play a sound using both adapters at same time?
A 14: Yes, you can. But you won't hear these two streams as a single, solid sound. Each audio adapter has its own clock and each clock frequency has a slight difference from a given sample rate. It makes two different adapters to go out of sync. The more time is elapsed, the more difference is introduced. In general, synchronous playing with two and more adapters is impossible without special synchronization schemes built in each adapter by design.