Tone of voice is how the character and intentions of your communication come through in your contracts. It is the way you say something, rather than what you say: it can affect how your communication is received and the impression you make on your counterparty. Tone of voice patterns can help you deliberately choose and shape how you say things, and how you are perceived.
In contracts, almost everyone uses, by default, a legalistic, technical, verbose, formal, and impersonal tone of voice. But this may not reflect the actual values of your organization, or the nature of the relationship you are trying to build with your counterparty. Certain groups of readers may be put off by this default tone of voice, and they may not read or engage with your contract. At worst, they may misunderstand your intentions, or not want to do business with your organization at all! In many situations, it is strategically wise to reassure readers with a more informal and approachable tone of voice, and let the values of your organization shine through. Tone of voice patterns offer you ways to be in control of this crucial aspect of communication.