Equalizer is a term that is commonly used in music technology and refers to a device that helps modify the tonal balance of an audio signal. There are numerous synonyms for the term, with each term referring to a specific type or function of the equalizer. Some common terms that can be used as synonyms for equalizer include tone controls, audio filter, musical instrument digital interface, parametric equalizer, graphic equalizer, and preamp. Other possible synonyms can include equalization module, tone-shaping device, audio processor, sound modifier, and frequency equalizer. No matter what the specific synonym used, the purpose of the device will remain the same, which is to modify or equalize the sound frequencies of an audio signal as per requirement.