Electronic musical instrument with expression control device for simultaneously controlling different tone signals by different amounts

Claim 1

An electronic musical instrument comprising at least two different music part playing sections, an expression control means for varying the volume of the tone signals from said different playing sections simultaneously and by different amounts, an amplifier and a loudspeaker; said expression control means including: an expression controller; a first input terminal for receiving a tone signal derived from one of said playing sections; a second input terminal for receiving a tone signal derived from the other of said playing sections; an output terminal for delivering a tone signal to said amplifier; a first variable resistance means connected between said first input terminal and said output terminal and having a resistance which is variable responsive to operation of said expression controller, said tone signal from said one playing section passing through said first variable resistance means to said output terminal; a second resistor connected between said second input terminal anD said output terminal and having a resistance higher than the minimum resistance of said first variable resistance means and lower than the maximum resistance of said first variable resistance means, said tone signal from said other playing section passing through said second resistor to said output terminal; and a third resistor connected between said first and second input terminals and having a resistance approximately the same as the output impedance of said playing sections.