I was trying to make a game and would like to get some opinions before the game gets too complicated. Here are my questions:

1. How can we play sounds nicely? What I took from some other project on this board creates a little blip in the game play.

2. How can I keep the cpu usage down while still maintaining smooth gameplay?

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I have a couple of responses to that.
My message loop looks something like (let f = desired frame rate):

Here, between frames the path 1,2,3,1,2,3,1,2,3, ect is beeing executed, thus eating up the cpu.
If I rely on vsync, I would have to know how to enable it, and then, rather sadly, I could not change the frame rate because then it would be fixed to something like 60.

can you make the global angle of view change?

There are lots of fancy things one could do, but I am more interested how to handle three treads:

Thread #1: handles physics at a constant refresh rate (120 fps)
Thread #2: draws the objects at the refresh rate of the hardware (60 fps)
Thread #3: handles a fluid simulation like in many popular games of this type, also at a constant refresh rate

I guess Thread #2 can be limited by gpu driver, but I using the windows function Sleep does not give enough granularity for Thread #1 or 3.