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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