Eumus Design Driver

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VAC driver has many configuration parameters. Some of them concern the entire driver and others are cable-specific, their value can be different for each cable.

Full version of VAC can be configured to create any valid number of Virtual Cables. Download loytec driver. Trial version is restricted.

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Sep 10, 2020 Hi, Thanks for splitting out in this thread, here is my DxDiag output.- System Information - Time of this report: 9/10/2020, 20:45:43 Machine name: - Operating System: Windows 7 Professional 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1ldrescrow.2) Language: English (Regional Setting: English) System Manufacturer: LENOVO System Model: 232579G BIOS: Phoenix BIOS SC-T. Driver Provider: EuMus Design HW Accel Level: Full Cap Flags: 0xF5F Min/Max Sample Rate: 200, 1000000 Static/Strm HW Mix Bufs: 20, 19 Static/Strm HW 3D Bufs: 0, 0.

Use the VAC Control Panel to easily configure driver and cable parameters.

VAC driver parameter tree is stored in the registry under the following key:

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HKLMSOFTWAREEuMus DesignVirtual Audio Cable4

Driver parameter values are stored immediately under this key, cable-specific parameter values are stored under 'Cable N' subkeys. All parameters are specified as DWORD values unless explicitly specified. If a value is absent or zero, it means a default/automaric settings unless stated explicitly. Value names are the following (literally, all spaces are meaningful, but case insensitive):

Driver parameters

  • Number of cables (1.256).
  • Maximum worker threads (0.32 in 32-bit systems, 0.64 in 64-bit systems).
  • Maximum worker thread priority (0.31).
  • Maximum number of channels (1.32) supported by the driver, for all Virtual Cables.
  • Event log level (0.9).
  • Timer resolution in percents of event period (10.100).
  • Number of cables to restrict KMixer thread affinity - number of cables beginning from which VAC will restrict affinity of System Audio Engine worker threads. If actual number of cables is greater or equal than this value, thread affinity will be restricted to run only on a first (number zero) CPU/core. It eliminates concurrent PortCls request processing in WavePci mode and will solve some problems like this. This parameter is ignored if PortCls engine is not used.
  • Number of cables to restrict client thread affinity - number of cables beginning from which VAC will restrict thread affinity of any client process (including System Audio Engine). It may be useful to solve problems like this. This parameter is ignored if PortCls engine is not used.
  • Format attribute support policy - code of globalformat attibute policy: 0 - default, 1 - process, 2 - ignore.

Cable parameters

  • Maximum instances (1.100).
  • Milliseconds per interrupt (1.20).
  • Minimum sampling rate (1000.384000).
  • Maximum sampling rate (1000.384000).
  • Minimum bits per sample (8.32).
  • Maximum bits per sample (8.32).
  • Minimum number of channels (1.8).
  • Maximum number of channels (1.32).
  • Stream format limiting (0 - 'None', 1 - 'Cable range', 2 - 'Cable format').
  • Volume control (0 or not present - disabled, nonzero - enabled).
  • Source line types mask - a bit mask that represents cable source line set. Bit 0 (value 1) means a microphone line, bit 1 (value 2) means an analog line connector, and bit 2 (value 4) means a digital line connector. You can combine them by the addition (1+2=3, Mic and Line inputs). This source line set means which lines are exposed by the cable's topology filter. Default value is 7 (all three line types).
    Don't change this parameter unless really needed.
    Under Windows 6.x, you need to restart System Audio Service or even reboot the system after changing this parameter. Driver restart is not enough to propagate it.
  • Connected source lines mask - a bit mask that represents currently connected source lines. Unlike the 'Source line types mask' parameter, this bit mask means which exposed lines are reported as 'connected' (plugged in) and must be a subset of the line types mask (all bits set in this value must be also set in the 'Source line types mask' value). Default value is 2 (only the Line Input is connected).
  • Clock correction - cable clock correction ratio multiplied by 1000000000 (10E9). Default value is 1000000000 that represents 1.0 ratio. Note: VAC versions prior to 4.11 use a different multiplier format that is not accepted by later versions so a default value is loaded if an old-format multiplier is found.
  • Enable channel mixing (0 - disabled, nonzero or not present - enabled).
  • Use standard PortCls engine (0 or not present - disabled, nonzero - enabled). Applicable to WavePci mode only.
  • Enable speaker pin type (0 or not present - disabled, nonzero - enabled).
  • PortCls capture port type, PortCls render port type - PortClsport/miniport types for capture (recording) and render (playback) pins (0 - auto, 1 - WaveRT, 2 - WavePci, 3 - WaveCyclic).
  • Disable cable signal level (0 or not present - cable signal level calculation/display is enabled, nonzero - disabled).
  • Disable stream signal level (0 or not present - stream signal level calculation/display is enabled, nonzero - disabled).
  • Restrict client thread affinity (0 or not present - disabled, nonzero - enabled).
  • Restrict KMixer thread affinity (0 or not present - disabled, nonzero - enabled).
  • Format attribute support policy - code of per-cableformat attibute policy: 0 - default, 1 - process, 2 - ignore.

Almost all of these parameters can be controlled by VAC Control Panel and are explained there. Some parameters that are rarely used, can be added, modified or deleted manually. For this, you can use standard Windows tools (RegEdit application, or 'reg' console command) or helper scripts provided in the 'tools' subfolder of VAC installation package. All these tools must be ran under an administrative account.

After creating, modifying or deleted some parameters manually, you need to restart VAC driver to propagate them.

When parameter value is changed by VAC Control Panel, its value is automatically copied to the HKLMSYSTEM CurrentControlSetServicesEuMusDesignVirtualAudioCableWdmParameters key to allow driver boot-time access. If you create/change a parameter under 'Software' branch manually, you should ensure its creation/changing under 'System' branch. Otherwise, the driver will be incorrectly configured on a next boot because there is no access to the 'Software' branch at a boot time.

However you could propagate parameter change to 'System' branch by hand, it's better to simply restart the driver that propagates parameter values automatically.

Saving and restoring VAC driver configuration

You can save VAC driver configuration by simply exporting the 'Software' registry subtree (the main key with all subkeys) mentioned above, using interactive RegEdit utility or the following console command (can be issued from a non-privileged account):

reg export 'HKLMSOFTWAREEuMus DesignVirtual Audio Cable4' '%HOMEPATH%documentsvaccfg.reg'

This command exports VAC driver configuration subtree to the 'vaccfg.reg' file located in your 'My Documents' folder.

To restore VAC driver configuration, first close VAC Control Panel if it is open, and delete both 'Software' and 'System' settings subtrees, using 'delsettings' command file located in VAC installation folder (usually 'C:Program FilesVirtual Audio Cable'). Locate VAC installation folder in File Explorer, right-click 'delsettings' and select 'Run as administrator'.

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Then import previously saved .reg file, using RegEdit or the following console command executed under an administrative account:

reg import '%SystemDrive%users<user>documentsvaccfg.reg'

replacing the '<user>' with actual user account name under which settings were exported.

After that, open VAC Control Panel and restart the driver to propagate boot-time parameters.

You can create as many configurations as you want, keeping them in different files.

To reset all VAC driver settings to their defaults, just delete configuration subtrees without importing any configuration.

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Please be careful with registry manipulations, any mistake would cause serious system malfunction.

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Please don't confuse VAC driver settings shown in VAC Control Panel with Audio Repeater application settings that can be specified in its command line.