Abstract: A keyboard teaching device for the self-instruction of a student of keyboard musical instruments is provided which enables the student to correlate the positions of the keys on a musical instrument keyboard with the positions of the notes on a musical scale. A keyboard having a plurality of keys corresponding to the notes of a musical scale for generating a first set of control signals in an initialization or set-up mode and key-note correlation signals in an instruction or game mode, at least one storage means having a predetermined combination of logical signals providing a source for a random sequence of one or more notes over a predetermined range in the game mode for generating a second set of control signals in response to the actuation of one or more keys in either mode and a means for generating audio tones and displaying video images in accordance with the first and second sets of control signals enables the student to visually and audibly check his or her selection of one or more of the keys.

Abstract: In an electronic musical instrument having at least one keyboard with keys corresponding to the notes of a musical scale apparatus for controlling the dynamic frequency modulation of tones reproduced from key pulses associated with active keys of the keyboard including a tonal effect control for selecting one of the desired modulation effects, vibrato, delayed vibrato or decayed vibrato, a multiplexed counter having a plurality of distinct sequential time periods for creating a delay proportional to its counting rate for generating output signals for controlling the time variant parameters of the modulation effects, a triggering means for initiating individually a count in each of the time periods of the counter in response to the generation of a key pulse, at least one count source for controlling the counting rate of the counter, a comparator for disabling the count in any of the time periods of the counter and timing alignment means for realigning the output signals of the counter with the corresponding ke

Abstract: A method and apparatus for interpolating between the harmonic structures of a waveform stored in memory during the transient periods of said waveform. In an electronic musical instrument having a greater number of selectively actuable switches than generators to cause the production of sound corresponding to the respective notes of the musical scale the present invention interpolates between the harmonic structures of a waveform stored in memory during the transient period of that waveform. This is accomplished through the use of memory units having a number of locations or zones within each memory where the number of zones is equivalent to the number of discrete harmonic structures. The first of the memory units contains a discrete fixed harmonic structure in each of its zones, and a second of the memory units contains a difference value in each of its zones where the difference value is equal to the difference between the discrete fixed harmonic structure in adjacent zones of the first memory.