A musical sound effect adding device (5) includes: a periodic signal generator (51) configured to generate a periodic signal synchronized with an n-beat or 1/n-beat (n: integer) cycle of a musical sound signal of a music piece data; a plurality of acoustic signal generators (521-524) each configured to generate an acoustic signal with a pitch continuously shifted on an octave basis in synchronization with the periodic signal; and a pitch shift section (51) configured to shift the pitch of the acoustic signal generated by each of the plurality of acoustic signal generators (521-524) to a mutually different pitch.
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