So here's the deal. I installed System Shock Portable, enabled the mouselook, higher res textures, and VDM sound. Initially I had some issues with the game crashing when I tried to switch resolutions, but this went away after I disable and then re-enabled the mouselook (this may change, but is working for now).
The problem is that after I fixed that, another issue popped up: wonky music. The music seems to slow and start up at random intervals, play over itself, and just generally sound like it's been run through a drunk filter. I tried uninstalling VDMSound to see if that would fix the issue, but SSP won't launch at all once I do that: I have to have VDM installed just to get to the initial SSP menu. I confirmed that the issue has to do with the resolution switching: sound only gets messed up if I switch away from 320x200.
The good news is that the sound issue isn't present with Dosbox, but since I'm running this on a somewhat underpowered laptop Dosbox lags even at 640x480, so it's not a great option. And on top of THAT, I tried installing the modified Dosbox, only to have it crash on startup. So I switched back to official Doxbox, but launching using Dosbox is no longer an option in the SSP menu.
Any advice on this stuff? Thanks for any help you can provide!