On all PowerMacs 44.1kHz is the native sample rate of the default sound card.
 Any other sample rate will be interpolated in some manner or other.  CSound
should not be crashing with other sampling rates, though for anything you try
in real-time you should definitely use 44.1 or an even multiple (for speed
issues).  There should be no problem writing any sample rate file.
-- 
Mike Berry
mikeb@nmol.com
http://www.nmol.com/users/mikeb