Vocal surgery

Voice therapy or voice training refers to any non-surgical technique used to improve or modify the human voice. Because voice is a gender cue, trans people may frequently undertake voice therapy as a part of gender transition in order to make their voices sound more like what is typical of their gender, and therefore increase their readability as that gender in society.

Voice feminization is the desired goal of changing a perceived male sounding voice to a perceived female sounding voice. The term voice feminization is used to describe the desired outcome of surgical techniques, speech therapy, self-help programs and any other techniques to acquire a female-sounding voice. The methods used for voice feminization vary from professional techniques used for vocal training, speech therapy by trained speech pathologists and several pitch-altering surgeries. Having voice and speech characteristics be in agreement with one's gender identity is important to transgender individuals, whether their goal be feminization or masculinization.

Voice masculinization is the opposite of voice feminization, being the change of a voice from feminine to masculine. Voice masculinization is not generally required for transgender men as the masculinising effects of testosterone on the larynx are usually sufficient to produce a masculine voice. However, Alexandros N. Constansis has stated that "apart from being unfair to transmen, [this assumption] is also overtly simplistic" and cites Davies and Goldberg in saying that "testosterone doesn’t always drop pitch low enough for FTMs to be perceived as male". Many transgender men also choose not to take testosterone, and use voice masculinization as an alternative way to deepen their voices.

Voice feminization refers to the voice change from male to female. It is considered an essential part of care for transgender women. Transgender women trying to feminize their voice represent the largest group seeking speech therapy services, therefore, most studies regarding transgender voice have focused on voice feminization, as opposed to voice masculinization.

...
Wikipedia