| Velocity Vector Tool: Use this tool to give point sources and microphones velocities during Run mode. To attach the velocity vector, click on the target object, then drag out the vector in the direction and to the length you desire. You can later change the length and direction of the velocity vector by resizing it, or by setting the horizontal and vertical velocities in the vector's Properties Box. With the velocity vector tool, you can generate Doppler shifts in the frequencies of both emitted and received sound waves.