Apparatus for presetting musical tone effects in electronic musical instrument

Claim 1

An arrangement for presetting musical tone effects in an electronic musical instrument, comprising: a first system having plural tablet switches, respective memory elements in a memory circuit, plural gates with respective control electrodes, said plural tablet switches being connected to respective memory elements in said memory circuit to control respective electrodes of said plural gates for selection of musical tone effects; a second system having said tablet switches connected to control electrodes of plural gates for selection of musical tone effects; selection means for selecting either one of the first system and the second system; said memory circuit having a write switch and being so arranged that after completion of writing output signals of respective tablet switches by operation of said write switch the memory contents remain unchanged until said write switch is operated again; plural line selection switches; said memory elements in said said memory circuit of said first system being arranged in plural lines; said plural line selection switches selecting the respective lines of said memory elements; said selection means having plural gates for opening said first system and closing said second system when said line selection switches are selectively operated, said memory circuit comprising further a random-access memory having input gate means, memory means connected to output means of said input gate means, transmission gate means connected to output means of said memory means; and indicating means arranged to be operated when said gates for selection of musical tone effects are opened; said memory means having memory elements arranged to form plural lines, each of which corresponds to one of said line selection switches, so that by operation of each of said switches the memory elements in each corresponding line can be simultaneously taken out for providing an increased variety of different musical tone effects to be added in the course of a musical performance, said write switch being connected to a control electrode of said input gate means through a differential circuit, said line selection switches being connected to terminals of respective words of said memory means, said line selection switches being also connected to a NOR circuit, and to an AND gate having an input terminal connected to ground through auxiliary switches connected in series, said auxiliary switches being arranged to be opened by closing the line selection switches.