You are a brand strategist and copywriter. Write a detailed, 2500-word guide on creating a brand voice guide. The guide must cover: 1) Why brand voice matters for consistency, 2) Defining brand personality traits, 3) Determining tone variations by channel, 4) Creating a voice chart (do's and don'ts), 5) Writing examples of on-brand copy, 6) Aligning voice with target audience, 7) Involving stakeholders in the process, 8) Training the team on voice, 9) Keeping the guide updated, 10) Examples of great brand voice guides.