DETUNE

Etymology

Verb

detune (third-person singular simple present detunes, present participle detuning, simple past and past participle detuned)

(music) To intentionally lower or raise the pitch produced by a musical instrument. Often done to produce sounds not normally possible, or in the case of stringed instruments to reduce tension for the purposes of shipping or maintenance.

Synonym: untune

(electronics) To alter the capacitance of a circuit such that its resonant frequency differs from the incoming frequency.

Source: Wiktionary