Other than that, I can get the game running pretty well out of the box, you need to disable Fullscreen optimization, limit the frame rate to 30 using your graphics card control software, set Nglide to use Vulkan, and have the monitor refresh rate at 60. It will play in widescreen and in full 1080 using Nglide config in the game's system folder. But the game will flash back and forth no matter what when loading, you will see your desktop, then a black screen, then the game will come on, its a little jarring the first few times but no real issue. The only major issue that is troubling, but also not game-breaking, is that there is no music playing during the game. The game does play well without music and can feel kinda immersive that way, but still, the game has a pretty good score, and it's a shame not to hear it.

I think Ziggurant the company that rereleased Bloodrayne now owns the rights to the game, so hopefully, they can patch it just a little more. This is the most underrated and forgotten FPS of its era, it breaks more ground than Kingpin or Half-Life, and feels like a combo of Sin, Half-Life and Kingpin rolled into one incredible package, plus it has one of the most original, interesting, and thought-provoking game worlds ever made.

Please, get this game running so everyone will check it out, seriously, how can PC FPS fans not know about this game? I mean, unless that twit Lilith has something to do with it...

For the music, try this solution: https://www.gog.com/forum/requiem_avenging_angel/no_music/post2

Also, I think "widescreen" here is just stretched, is it not? Or did you get proper widescreen (with correct proportions) to work?