brought to correct pitch; "his tuned violin"; "the attuned instruments"

so adjusted as to be appropriate or brought into harmony; "an industry not attuned to the demands of the market"; "a remark keyed to the situation"; "charges finely tuned to the amount a student can afford"

tuned in equal temperament; or so tuned as to allow modulation into other keys

Refers to a circuit or device which is most sensitive to a specific frequency.

Regarding a circuit or device, which is most sensitive to a certain frequency.