A sound signal synthesis method includes generating first data representing a deterministic component of a sound signal based on second control data representing conditions of the sound signal, generating, using a first generation model, second data representing a stochastic component of the sound signal based on the first data and first control data representing conditions of the sound signal, and combining the deterministic component represented by the first data and the stochastic component represented by the second data and thereby generating the sound signal.

A content data generating device includes a first storage configured to store content data including at least either video information or audio information, a second storage configured to store variation data representing change of a parameter on the content data, a designator configured to designate a portion of the variation data, and a content data generator configured to process the content data according to a value of the parameter of the portion of the variation data designated by the designator to generate processed content data.

For a parameter used by a tone generator unit to generate an audio signal, type of an effect to be given to the audio signal and degree of the effect to be given to the audio signal are set according to an operation of a panel strip which functions as a combination of an increase control decrease controls with an upper cursor part and a lower cursor part. This setting is made so that when an operation to further decrease the degree of the effect to be given to less than zero is detected, the type of the effect to be given to the audio signal is changed.

A content data generating device includes a first storage configured to store content data including at least either video information or audio information, a second storage configured to store variation data representing change of a parameter on the content data, a designator configured to designate a portion of the variation data, and a content data generator configured to process the content data according to a value of the parameter of the portion of the variation data designated by the designator to generate processed content data.

For a parameter used by a tone generator unit to generate an audio signal, type of an effect to be given to the audio signal and degree of the effect to be given to the audio signal are set according to an operation of a panel strip which functions as a combination of an increase control decrease controls with an upper cursor part and a lower cursor part. This setting is made so that when an operation to further decrease the degree of the effect to be given to less than zero is detected, the type of the effect to be given to the audio signal is changed.