To practice and increase voice skills in Bitlife, you will need to take voice lessons as soon as they unlock and practice them at least once or four times every year.
Doing so will raise your voice skill little by little to eventually your skill level will be in the green and considered highly skilled.
Voice lessons are also similar to instrument lessons that players unlock when they turn eight, but instead of practicing an instrument, the lesson is instead for singing.
Voice lessons are also vital for those who wish to pursue a career as a singer or solo artist, so you will need to age to the age of eight years old to take voice lessons.
At this point, lessons will unlock and can be started by visiting the Mind and Body tab under activities and then scrolling down. Clicking on voice lessons will ask your parent if you can take them; after this, the option to practice your voice skills will unlock.
You can find this option under the same Mind and Body tab, and to practice your skills, simply click on voice lessons and then click yes to practice when prompted.
Doing so will raise your singing skills a little each time you take lessons and can be repeated at least three or four times before you stop gaining progress each year.
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