Andy Timmons Signature Overdrive. The AT + features Volume, EQ, Drive, Air, and a three-way toggle for 25-watt, 50-watt, or 100-watt modes. The Volume gives you plenty of headroom to play with, while the Drive control has a wide range from high gain blues to thunderous distortion. The tone controls work together to give you the ability to shape your tone and sit perfectly in a mix. The EQ works as a standard bright/dark tone control, while the Air control rolls in top end like a presence control so you can have just the right amount of brightness for articulation and clarity. The three-way toggle gives you the feel of different amplifier wattages. The up position is the 25-watt setting with the most compression and saturation and the least amount of volume. The down position is the 50-watt setting for a good balance of compression and openness. The middle position is the 100-watt position for tons of volume and open crunch while being less focused.