1. Starting with your dominant hand in a "V" shape. The fingers are spread apart, with the thumb tucked towards your palm.
2. Moving the "V" hand from your throat outwards. The motion is like you're pushing the sound of your voice out of your throat.
You can also add a slight twist to your wrist as you push the hand outwards for emphasis.
Remember, the sign for "voice" is often used in conjunction with other signs, like "loud" or "soft," to create a more complete phrase.