Abstract: A method of morphing between the states of a sound, which is defined by a group of one or more parameters. The method comprises providing a display of at least five fixed points each associated with the group of one or more parameters. The values of each of the parameters in the group are predetermined for each fixed point and the value of at least one parameter for each fixed point is different from the value of the same parameter for all the other fixed points. The method further comprises positioning a unfixed point in the display to set the state of the sound, whereby the value of each of the parameters of the group defining the state is determined using the value of the corresponding parameter of each of the fixed points combined with a respective weighting factor. The respective weighting factor for each fixed point depends on the position of the unfixed point relative to that fixed point.

Abstract: A method of simulating a string using a wave equation which relates movement of the string in time to force acting on the string, wherein the force acting on the string simulates a stream of a fluid medium flowing relative to the string. The simulated string is supported between two supports and is aligned at rest in a first direction between the two supports, a first of which allows movement in a second direction orthogonal to the first direction and a second of which does not allow movement. The string is then caused from rest to vibrate in a plane, which includes the first and second directions, by turbulence in the fluid flow causing the stream of fluid medium to exert a pressure on the string in the second direction. Movement of the string out of alignment with the first direction causes the stream of fluid medium flowing in the first direction to exert a force on the string in the second direction.