FWIW, It appears that a new version ov VAC is available...

      Version 4.13<http://software.muzychenko.net/eng/vac.htm>  (23.07.13)

  * Fixed a bug preventing stream buffer watermark parameters from being
    loaded on restart.
  * Fixed bugs causing integer divide overflows in Audio Repeater (both
    MME and KS versions).
  * Added a workaround for PortCls bug causing BSOD (bugchecks 0x50 or
    0xD6) in GetMaxMapRegisters function if Driver Verifier with the
    special pool is used for VAC driver verification.
  * Added peak signal level indicators to Control Panel.
  * Changed signal level indication in Audio Repeater from average to peak.
  * Fixed stream position timestamp error if PortCls is not used
    (occurred in Open Broadcaster Software).
  * Added a feature to control playback pin type (speaker or line out).
  * Fixed sleep/hibernate problems.
  * Added master volume control.

In a brief testing period, it appears to work fine on my Win8 x64 PC with PowerSDR and WSPR. So far I have found no down side but have found no big benefit either. Whether this is a worthwhile upgrade for you, depends on your experience with the current version and your comfort in change.

AL, K0VM
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