//source : http://forums.creativecow.net/thread/19/863470
// another sound into cinema thingy :
http://forums.cgsociety.org/archive/index.php/t-277132.html
http://www.wonderhowto.com/how-to/video/how-to-work-with-sound-in-cinema-4d-s-mograph-63814/view/
First open some project (at least a cube... or else...)
Open the Timeline / File / Add Special Tracks / Sound...
In the Attributes-Manager import your sound...
Make sure it’s either .aif or .wav / 44100 Hz 16 Bits... (otherwise it won’t show up)...
Play your sound...
In the viewport check “Play Sound During Animation”...