I have actually used this very tool back in the day to help learn how to speak in a male or female voice. One of the five things I do is manipulation of my ton

I have actually used this very tool back in the day to help learn how to speak in a male or female voice. One of the five things I do is manipulation of my tongue to change the cavity of my mouth to make the space bigger (more masculine) or smaller (more feminine) which this tool demonstrates very well. Edit: to be clear I used to sound male 24/7 and now I sound female 24/7 Rather than thinking you are speaking male or female it helps if you think you are playing a musical instrument with a number of controls that you control (with your mind whahahaha). Then it is just about learning what each control does and how to play them so you get the result you want. Your voice is muscle memory so while at the start I had to actively "play" a female voice that is no longer the case and now if I ever want to "play" a male voice I have to actively think about how I am going to speak each word to make it male.