Respective waveform data on pad strike sounds, rim strike sounds, and
rim-shot sounds are stored in a waveform memory, and when a CPU detects a
strike detection signal outputted by either of a pad sensor, and a rim
sensor, provided in a head unit, a musical tone generating controller
reads out waveform data on an strike sound corresponding to the strike
detection signal from the waveform memory, thereby generating a musical
tone signal corresponding thereto before outputting. Thereafter, when the
CPU detects a strike detection signal outputted by the other of the pad
sensor, and the rim sensor within a predetermined time, waveform data on
a rim-shot sound are read out from the waveform data memory, thereby
generating a musical tone signal corresponding thereto before outputting.
A sound output unit produces electronic strike sounds corresponding to
those musical tone signals, respectively.