Abstract: A musical tone generating apparatus of an adapter type to be connected to a host electronic keyboard musical instrument via an information cable for generating musical tone signals in accordance with key information supplied from the host musical instrument. The musical tone generating apparatus comprises switches for designating a fractional key range in the keyboard and generates a musical tone signal only when a key within the designated key range is depressed. A plurality of musical tone generating apparatuses of the same construction as the aforesaid musical tone generating apparatus can be connected in a cascade fashion to a single host electronic keyboard musical instrument.

Abstract: Various types of information utilized for performance of an electronic musical instrument are stored in first and second memories. The information stored in the first memory represents parameters, as a preset data set, which determine a characteristic of a musical tone to be produced. The information stored in the second memory is auxiliary data representing information other than the parameters such as performance messages. The auxiliary data used in combination with the preset data set are stored in the second memory through auxiliary data input means, such as keys of the electronic musical instrument, and are read out of the second memory to be displayed on the display means.