Does my tone affect training?
Dogs learn through association. Because of this you want to limit your movement to the hand prompt to avoid your dog picking up on a different movements. Your tone of voice can also influence what your dog learns. You can teach him that a calm tone can mean casual, while an urgent voice means drop everything and do what I tell you now. If using a frustrated tone while training, your dog may learn to listen to commands when said in that tone.
When training, once your dog learns the basic command, try to generalize your tone to help your dog listen to you no matter what tone you use.