harmonizer

Pronunciation: /ˈhɑː.məˌnaɪ.zə/

The English word “harmonizer” has 2 meanings listed here.

noun

One who harmonizes or brings harmony.
An electronic pitch shift effect where the shifted version is played alongside the original in harmony.

From harmonize + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.