Electronic keyboard instrument with an unique tone channel assignor for percussion tones

摘要

An electronic keyboard instrument having simultaneous tone channels for generating a plurality of kinds of tones such as percussion tones upon a keyboard operation is disclosed. A memory (17b) stores inherent tone duration values of different kinds of tones to be generated in correspondence with a plurality of keys of a keyboard. A register group (32) for holding tone duration values in correspondence with a plurality of tone channels is arranged. The values held in the register group are decreased by a subtracter (33) along with an elapse of time. Upon a key- ON event, a detector (34) detects the minimum value of the tone duration values held in the register group. A channel corresponding to the register which holds the minimum value is assigned as a new tone channel, and the content of the register is updated with the fixed tone duration value stored in the memory. The updated register renews assignment of a tone channel in a tone source.