I finally routed the PC speaker through my SB16. It was way too loud. I had to cut the speaker wire and splice it with another, but now I can control the volume. I'd like to add in a switch and volume option though, so that I can use the built in speaker, as its sound is unique.
I also swapped out my CD rom for a newer one I found the other year. The newer one was from a Dell. It's faster and substantially quieter, which is nice. I didn't want to play CD games on my 486, because the drive that came with it sounded like a washing machine on spin cycle when in use.
The only bummer, is that the new CD drive is a dark gray, so it doesn't quite match the black bevel around it on my case -- which is beige with black accents.