Yes, MTF (male-to-female) individuals can change their voice without surgery or therapy. This can be done through voice therapy, which is a type of speech therapy that helps people to change the pitch, resonance, and other aspects of their voice.

Voice therapy can be effective in helping MTF individuals to achieve a more feminine voice. However, it is important to note that voice therapy is a long-term process, and it may take several months or even years to see significant results.

In addition to voice therapy, there are a number of other things that MTF individuals can do to change their voice. These include:

• Practicing vocal exercises: There are a number of vocal exercises that can help to raise the pitch of the voice. These exercises can be found online or in books on voice feminization.
• Changing the way you speak: There are a number of things that you can do to change the way you speak in order to make your voice sound more feminine. These include speaking from the diaphragm, using a higher pitch, and enunciating more clearly.
• Changing your vocal resonance: The resonance of your voice is the way that your voice sounds when it bounces off of your vocal cords and other parts of your throat. There are a number of things that you can do to change the resonance of your voice, such as raising your larynx and using a more open mouth.

It is important to note that there is no one-size-fits-all approach to changing your voice. What works for one person may not work for another. It is important to experiment and find what works best for you.

If you are considering changing your voice, it is important to talk to a speech therapist who specializes in voice feminization. They can help you to assess your individual needs and develop a plan to achieve your goals.

Here are some resources that you may find helpful:

• The National Center for Transgender Equality: The National Center for Transgender Equality (NCTE) has a comprehensive website with information on voice feminization for transgender individuals. The website includes information on the different techniques for voice feminization, as well as resources for finding a speech therapist.
• The World Professional Association for Transgender Health: The World Professional Association for Transgender Health (WPATH) has published a set of guidelines for voice feminization for transgender individuals. The guidelines include information on the risks and benefits of different techniques for voice feminization, as well as recommendations for speech therapists.
• The Trevor Project: The Trevor Project is a national organization that provides crisis intervention and suicide prevention services to LGBTQ youth. The Trevor Project also has a website with information on voice feminization for transgender individuals.
• Speech therapists: There are a number of speech therapists who specialize in voice feminization. These therapists can help you to assess your individual needs and develop a plan to achieve your goals.

MTF (Male-to-Female) individuals can work on changing their voice without surgery or formal therapy. While voice therapy or coaching with a speech-language pathologist who specializes in transgender voice training is often recommended for achieving more significant and lasting vocal changes, there are steps you can take on your own to explore and experiment with your voice. Here are some techniques you can try:

1. Pitch Control: Experiment with raising the pitch of your voice by consciously speaking at a higher pitch. Practice speaking in a higher range and gradually incorporate it into your everyday speech. Listening to and imitating feminine voices can also help you develop a higher pitch.
2. Resonance and Articulation: Pay attention to the resonance and quality of your voice. Try speaking from the front of your mouth instead of the chest, which can create a more feminine resonance. Focus on clear and precise articulation of words.
3. Speech Patterns and Intonation: Observe the speech patterns and intonation of women around you. Pay attention to the way they emphasize certain words, use inflections, and convey emotions. Practice incorporating feminine speech patterns and intonation into your own speech.
4. Breath Control: Work on breath control to support vocal production. Practice diaphragmatic breathing to create a more steady and controlled airflow for speech.
5. Vocal Warm-up Exercises: Engage in vocal warm-up exercises to improve flexibility and control over your voice. These exercises can include humming, lip trills, tongue twisters, and scales.
6. Record and Listen: Record your voice and listen to the recordings to identify areas for improvement. This can help you become more aware of your speech patterns, pitch, and resonance, and allow you to track your progress over time.

While self-guided techniques can be a starting point, working with a speech-language pathologist who specializes in transgender voice training can provide more comprehensive guidance, personalized feedback, and targeted exercises. They can help you achieve more refined and consistent vocal changes and offer support throughout the process.

Remember, changing your voice is a skill that requires practice, patience, and consistency. It can take time to develop a voice that feels comfortable and authentic to you. Celebrate your progress along the way and be gentle with yourself as you explore and embrace your evolving voice.