30-FPS not possible?

I hope this doesn't seem like that dumb of a question, but all I've found are discussions on how to increase frame rate in N64 games. My question is how to DECREASE the framerate to the "standard" 30-FPS, because many games are unplayable at the 60-frame speed. Maybe it's just me, but I like to be as accurate as possible with emulation. Has anyone figured out how to throttle the FPS to half-speed? Any assistance would be greatly appreciated!
Mordrach, the total newbie.

Interesting...

I did not realize that that was what FPS stood for here. However, I'm pretty sure that it's not running at the proper speed for N64 games, because the music plays twice as fast as normal, and the polygons move too smoothly/quickly to be standard N64 speed, so I guess the real question is, how do I slow down Project 64? I've already got the speed limiter on, but it's still moving too fast to be properly emulated. When I change the CF value, that does absolutely nothing, too, it appears. I hope this clarifies what I'm talking about...
Mordrach, still a complete newbie.