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To get higher performance and less latency, use the lowest level interface Or DirectSound (in all versions of Windows). The following list shows audio interfaces in the order of decreasingĭirectSound with hardware acceleration (in Windows 5.x only) Presents at least three audio interfaces: WDM/KS, DirectSound and MME (Wave), with a pair of Using these pins, Windows audio subsystem builds higher-level audio layers Of render and capture pins for each cable. So you can choose PortCls interfaces and KS protocols for each sideĬhoosing most appropriate client interfaceĪs a KS filter, VAC driver presents a pair In case of stream stability problems, try WaveCyclic as a simplest and mostĬapture (recording) and render (playback) cable sides function independently.

If some applications cannot access Virtual Cable endpoints, use WavePci as aīalanced solution (for these endpoints only). In general, use the following rules to choose PortCls interfaces: Might need to use WaveRT interface for the appropriate cable side. Vice versa, some new audio applications may support only RT Audio protocol so you If an application cannot access Virtual Cable pins set to WaveRT mode, try to switch theĪppropriate cable side to WavePci or WaveCyclic. However, RTĪudio may not be supported by some audio applications offering "KS Port/miniport are fully supported by PortClsĪnd RT Audio protocol is fully supported by System Audio Engine. The right that indicate actually used port/miniport types. Two-letter abbreviations, "WC", "WP" and "WR" at Required for port type changes to take effect. KS filter and KS client, while WaveRT implements "RTĪudio", "looped" or "realtime" streaming protocol.Ĭontrol Panel, for each cable side independently. "standard" or "legacy" KS streaming protocol between WaveCyclic and WavePci both implement "old", These internal interface types affect not only internal communications betweenĮfficiency.

Newest and most efficient, and WavePci has less latency than WaveCyclic. In general, WaveCyclic is most simple and reliable, WaveRT is

VAC implements all three PortCls port/miniport interfaces: WaveCyclic, WavePciĪnd WaveRT. Usage rules before attempting to use advanced features.Ĭhoosing most appropriate PortCls interfaces This section describes advanced usage methods.