Abstract: In apparatus for detecting string stop position for string instruments, there is provided fret detecting means comprising coils which generate an induced voltage by means of an electric current flowing through each of the frets, whereby the string stop position may be detected on the basis of the induced voltage generated by the coil which corresponds to the fret contacting the string when the string is stopped.

Abstract: A device for producing an ensemble effect in an electronic musical instrument. The device has a plurality of parallel electronic delay circuits adapted to be supplied with a musical tone signal, delay time modulating circuits coupled to each of said delay circuits for modulating the delay time in each delay circuit, a modulating signal generating circuit arrangement coupled to the delay time modulating circuits for supplying modulating signals to the respective delay time modulating circuits which are different from each other and the frequencies of which are in an integral multiple relationship to each other. Amplifiers are coupled to each of the delay circuits for amplifying the output thereof, and the amplifier outputs are mixed either electronically or acoustically.