Slightly crucial question for a voice artist - what does he sound like...

hear me

Here's a compilation of real work.

You'll hear: corporate narration, radio commercial,
live event VOG, live performance with piano,
live radio presentation, narration.

Here's a Powerpoint presentation made into a video with voiceover, to promote the concept of, er, turning a Powerpoint presentation into a video with voiceover.
(features a rare, and mercifully brief, appearance in-vision by Your Correspondent)