I've seen the light!
After puzzling for a long time on why changing gamma settings in my
Voodoo control panel had no affect on visual appearance on W95
applications (DOS not tested), I found that the Millenium's own gamma
settings were overriding whatever Voodoo put in the autoexec.bat.
In the version of Millenium drivers I am using, 3.70, the gamma is
adjusted under the Colour tab of display properties. A quick
adjustment of the gamma there before F1RS, and I can actually see in
the tunnel.
Hope this helps anyone else who is struggling!
--
Bryn