How do founders train AI to write in their own voice?

Feed the model 5 to 20 of your best posts or emails, have it extract a written voice profile (vocabulary, rhythm, opinions, phrases you avoid), then keep that profile in a Claude Project or custom GPT so every draft starts from your voice instead of the internet's average. Correct it specifically and repeatedly for a few weeks and drafts converge on you. Voice and avatar cloning extend the same idea to audio and video.

A quick orientation. The real value is below: resources worth your time, from people who've actually done it.