(57) When picking of a string is performed, the vibration of the string is detected by
string trigger switches (TSW) accurately and quickly. When a fret operation position
is changed during generation of a musical tone from musical tone generating circuit
(60) caused by the string picking, the pitch of the musical tone is changed according
to outputs of fret switches (FSW) to the one corresponding to the new fret operation
position without generating a new musical tone. When the same string is stroked successively,
the succeeding musical tone is generated while keeping the reverberation of the previous
musical tone under the control of microcomputer (30). The musical tone once generated
will be stopped from being generated upon elapse of a predetermined time from the
beginning of the tone generation, irrespective of the type of its timbre. When a
change of a fret operation state is detected by switch status detection circuit (50)
to change to an open-string operation state after the string picking, the generation
of the musical tone being generated from circuit (60) stops at that timing. When this
change occurs, it is selectable whether the generation of the musical tone is to be
stopped or its pitch is to be changed to the one corresponding to the open-string
operation state. The generated musical tone can freely be stopped from being generated
through a manual operation.
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