That tutorial is helpful to understanding how we were able to generate the sound of a waterfall in space, but not mandatory. The actual story of the waterfall is detailed below. The approach was straightforward. The sound (wav or mp3) of a waterfall (the Salmon Leap, right) in Romsey (Hampshire UK) is 'inverted' using the principles of the above tutorial to produce an estimate of the number of sizes of bubbles being entrained in the fall.

An artist’s impression of Titan's surface, with Saturn dimly in the background through Titan's thick atmosphere. The Cassini spacecraft flies over the surface with its High Gain Antenna pointed at the Huygens probe as it nears the end of its parachute descent. Thin methane clouds dot the horizon, and a narrow methane spring or "methanefall" flows from the cliff at left and produces considerable vapour. Smooth ice features rise out of the methane/ethane lake, and crater walls can be seen far in the distance. (Illustration by David Seal, Image credit: NASA/JPL/Caltech).

This information is then used to predict the sound (wav or mp3) of a similar fall on Titan (left), the largest of Saturn's moons. If such falls exist there, then they will not be of water, but of methane and ethane. The Cassini-Huygens space mission will take a microphone, amongst other apparatus, to Titan in early 2005.  It is not known whether Titan does indeed have lakes, falls, seas etc. However if the microphones were to record the sound of a 'splash down', that question would be answered. However if we understand the physics well enough, it is possible to interpret the sound generated by falls, breaking waves, and other natural phenomena to gain information about the environment. This would be very valuable to scientists. Click here to hear the splash down sounds, and Click here to learn how it was done.