Stereo, 16-bit, 44100 Hz. 15 seconds long.
All the tests on Mac OSX were made with the playSound function. The Linux tests were not, wich explains what happened when testing on Linux. I thought there was a script calling the playSound function in WaterGameDemo too. So I just changed the wav there for the ogg. But I just saw it has no script in the scene in the water demo. Now I know we can play sound by just getting a looping sound in the scene.