Tone generator apparatus sharing parameters among channels

A music apparatus generates a plurality of music tones arranged in a set of performance parts of a music piece from a plurality of channels based on sequence data. A tone generator has a plurality of tone generating elements in correspondence to the plurality of the channels for generating therethrough the music tones in parallel manner. An assigning section assigns the plurality of the channels to the set of the performance parts such that each performance part may involve one or more of the channels. A sequencer processes the sequence data to sequentially provide parameters for use in the tone generating elements, the sequencer being operative when the assigning section assigns two or more channels to one performance part for providing first parameters set individually to each of said two or more channels and a second parameter set commonly to said two or more channels assigned to said one performance part. A register is divided into a first area for storing the first parameters provided from the sequencer and a second area for storing the second parameter provided from the sequencer. Each tone generating element uses both of the stored first parameter and second parameter set to the corresponding channel and characterized by both of the first and second parameters.