Narration styles vary greatly depending on the project and the audience.  You may want drama and intrigue for a cinematic documentary about snow leopards in the wild, or you may need a more conversational, friendly voice to explain how a product works, to guide medical students through a complicated concept, or to politely direct customers waiting anxiously on the phone.  The aim is always to sound clear, natural, and engaging. 

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I generally use my own accent when narrating, but I'm happy to switch if required.