Electronic musical instrument having a pan-pot function

Claim 1

An electronic musical instrument having pan-pot means for generating musical sounds with pan-pot of the performed sounds in accordance with digital pan-pot data, the pan-pot means including: control means including: means for providing a plurality of preset pairs of first and second mutually complementary control signals, said control signal providing means including a reference voltage generator and first and second resistance type voltage division circuits for dividing a reference voltage generated from said reference voltage generator; and switching means coupled to said control signal providing means and including first and second analog multiplexers for selectively outputting pairs of said first and second mutually complementary control signals in a given sequence in accordance with said digital pan-pot, said selected pairs of first and second control signals always having a mutually complementary relationship, said first and second analog multiplexers each having a plurality of control signal input terminals, said pairs of control signals respectively generated from said first and second resistance type voltage division circuits being coupled to said plurality of control signal input terminals of the first and second analog multiplexers while maintaining said complementary relationship between said control signals, and said first and second analog multiplexers each also having digital control input terminals for receiving said digital pan-pot data; first sound volume variation means controlled as a function of said first control signal to vary the sound volume of a musical tone; and second sound volume variation means controlled as a function of said second control signal to vary the sound volume of a musical tone; said first and second sound volume variation means each including amplifier means having an amplification factor controlled by the respective control signals applied thereto, such that when said complementary control signals are applied at the same time to the respective amplifier means, the total musical sound produced and heard by a listener is substantially constant, irrespective of the pan-pot of the musical sound; whereby a pan-pot of a sound performed in controlled in accordance with said first and second control signals by said pan-pot means.