An effects device comprising: an input unit configured to input an electrical musical sound signal input from an electric guitar; a level detecting unit (220, 10c1~10c33) configured to detect a level of the musical sound signal input by the input unit for each of multiple frequency bands; and an extraction unit configured to extract a frequency characteristic of the musical sound signal based on the level (L1~L33) of the musical sound signal detected by the level detecting unit (220, 10cl~10c33); the effects device being characterized in further comprising: an individual total calculating unit configured to calculate, for each multiple frequency bands, an individual total (A0~A32) that is a total of the level (L1~L33), which are detected by the level detecting unit (220, 10c1∼10c33), of frequency bands lower than the frequency band; and an adding unit (250, 10bl~10b33) configured to add a predetermined sound effect only to a frequency band of an electric signal generated by a string at lowest frequency among a plurality of strings of the electric guitar of the musical sound signal based on the frequency characteristic extracted by the extraction unit; wherein the extraction unit is configured to extract a frequency characteristic of the musical sound signal according to a frequency band corresponding to a frequency band for which the individual total is smaller than a predetermined value among the individual totals for each frequency band calculated by the individual total calculating unit based on the level (L1~L33) of the musical sound signal detected by the level detecting unit (220, 10cl~10c33). an input unit configured to input an electrical musical sound signal input from an electric guitar; a level detecting unit (220, 10c1~10c33) configured to detect a level of the musical sound signal input by the input unit for each of multiple frequency bands; and an extraction unit configured to extract a frequency characteristic of the musical sound signal based on the level (L1~L33) of the musical sound signal detected by the level detecting unit (220, 10cl~10c33); the effects device being characterized in further comprising: an individual total calculating unit configured to calculate, for each multiple frequency bands, an individual total (A0~A32) that is a total of the level (L1~L33), which are detected by the level detecting unit (220, 10c1∼10c33), of frequency bands lower than the frequency band; and an adding unit (250, 10bl~10b33) configured to add a predetermined sound effect only to a frequency band of an electric signal generated by a string at lowest frequency among a plurality of strings of the electric guitar of the musical sound signal based on the frequency characteristic extracted by the extraction unit; wherein the extraction unit is configured to extract a frequency characteristic of the musical sound signal according to a frequency band corresponding to a frequency band for which the individual total is smaller than a predetermined value among the individual totals for each frequency band calculated by the individual total calculating unit based on the level (L1~L33) of the musical sound signal detected by the level detecting unit (220, 10cl~10c33). an individual total calculating unit configured to calculate, for each multiple frequency bands, an individual total (A0~A32) that is a total of the level (L1~L33), which are detected by the level detecting unit (220, 10c1∼10c33), of frequency bands lower than the frequency band; and an adding unit (250, 10bl~10b33) configured to add a predetermined sound effect only to a frequency band of an electric signal generated by a string at lowest frequency among a plurality of strings of the electric guitar of the musical sound signal based on the frequency characteristic extracted by the extraction unit; wherein the extraction unit is configured to extract a frequency characteristic of the musical sound signal according to a frequency band corresponding to a frequency band for which the individual total is smaller than a predetermined value among the individual totals for each frequency band calculated by the individual total calculating unit based on the level (L1~L33) of the musical sound signal detected by the level detecting unit (220, 10cl~10c33).