And another fix (clearing the high bit of PBR and ROMBR on set) gets the Voxel demo showing things, though very obviously wrong things:

[Linked Image from moogle-tech.com]
[Linked Image from moogle-tech.com]
[Linked Image from moogle-tech.com]
[Linked Image from moogle-tech.com]
[Linked Image from moogle-tech.com]
[Linked Image from moogle-tech.com]