An electronic musical instrument having a plurality of tone volume setters for presetting the amplitude levels of musical tone signals of respective tone color voices comprises a plurality of variable resistors gang-operated with the tone volume setters and connected to a power source so as to deliver such levels of voltage as represent the preset states of the tone volume setters; and indicators respectively connected to the variable resistors and indicating the respective preset states. The br...

A duet interval data memory includes tables each of which corresponds to a particular chord type and prestores a plurality of duet interval data. One of the tables is selected in accordance with the type of a chord being played in a lower keyboard. A note interval between a root note of this chord and a melody note being played in an upper keyboard constitutes a relative note. The duet interval data is read from the selected table in response to this relative note. A calculator alters the melody...

An apparatus for automatically composing a music piece is provided by comprising a memory preliminarily storing plural kinds of pitch data. From this memory, at-random extraction is made of those pitch data agreeing with predetermined music conditions, and they are timewisely successively delivered out to be imparted durations, respectively, to form a composition data consisting of plural sets of pitch data and duration data amounting two to four measures to make a music piece. This composition ...

Tonality designation of an electronic keyboard instrument is realized by utilizing keys instead of conventional tonality designation switches provided on the panel of its. The tonality designation system comprises a tonality data forming circuit and a memory. The tonality data forming circuit generates tonality data consisting of keynote data and scale data representative of key note and type of scale respectively based on key depression and transfers it to the memory in advance before performan...

In an electronic musical instrument of waveshape memory type, a waveshape memory stores waveshape data which covers from start to end of a musical tone and which varies litle by little in shape, amplitude and/or cyclic period as the waveshape extends to the succeeding cycles. A start address from which the waveshape memory begins to be read is controlled by expression control such as a key touch response structure or expression pedal, so that the tone color, level and/or pitch of a produced tone...

One or a plurality of tones having a predetermined interval relation in terms of degrees with reference to tones produced by depressed keys of a keyboard are automatically selected from among diatonic scale tones of a performed tonality and the selected tones are produced as musical tones concurrently with the depressed key tones. To this end there are provided a tonality designator for producing an information representing the performed tonality, a duet note data forming circuit for forming pit...

The electronic musical instrument is provided, in addition to usual tone producing circuitries associated with playing keys, with a chord designating circuit designating, according to key depression, a plurality of notes of that constitute a chord, a change detecting circuit for detecting a change in designated chord, a note selection circuit for selecting a note from among the designated notes according to a predetermined condition related to the preceeding selected note when the chord change i...

An electronic musical instrument is of a type in which bass/chord performance can be automatically performed without depression of the keys on the keyboard. This electronic musical instrument has a chord constituent note data producing circuit which stores several kinds of chord progression patterns each of which consists of a series of plural chord data aligned in sequence. The chord progression pattern to be played is selected by the chord progression designation switch. The chord note data pr...

An electronic musical instrument is of a type in which chord constituent tones are automatically produced at timings determined by the rhythm to be played and according to random selection of notes. A rhythm pattern pulse generator generates a rhythm pattern pulse representing the timings of tones to be sounded according to the selection of the rhythm. A constituent degree data generator generates, at the timings of the rhythm pattern pulse, degree data signals representing degrees of chord cons...

A tone generator for an electronic musical instrument. In the tone generator, a coincidence output is produced when contents of a counter which successively counts a clock pulse have amounted to a value representing a tone of a depressed key. The counter is reset by a reset pulse with delay of a predetermined clock time from the time when the coincidence output is produced. An example is disclosed in which an output of a desired period is statically produced by generating the reset pulse with de...