[CsMain] Doubt on the rendering loop (play sounds, physics update, etc.) of CrystalSpace

I developed some functions for playing sounds.But in the line 39 of
file http://fgc.svn.sf.net/viewvc/fgc/src/high-level/fSound.h?revision=18&view=markup
, hangs when playing sound. And another thing, I can not show anything
on the screen does not show that the level loaded, and when I try to
draw a line on the screen the program falls.
What role I have to call for CrystalSpace, work normally? I do not
just call the loop of Crystal Space, I want to call functions that
render (play sounds, etc.) step by step.
Here's the function
http://fgc.svn.sf.net/viewvc/fgc/src/fge.h?revision=18&view=markup

and all the code here:
http://fgc.svn.sf.net/viewvc/fgc/src/

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