There are three voice tones available to negotiators: 1. The late-night FM DJ voice: Use selectively to make a point. Inflect your voice downward, keeping it calm and slow. When done properly, you create an aura of authority and trustworthiness without triggering defensiveness. 2. The positive/playful voice: Should be your default voice. It’s the voice of an easygoing, good-natured person. Your attitude is light and encouraging. The key here is to relax and smile while you’re talking.