with a resonator; the word is commonly used as a generic term to describe bluegrass resonator lap steels of any brand. Bluegrass dobro players often use a "Stevens bar" which has a deep groove in it to allow the steel to be grasped more firmly so it can be lifted and angled vertically downward slightly for playing single notes. The technique also allows for hammer-on or pull-off notes when there is an adjacent open string. Dobro players often slant the bar horizontally when playing to change an interval between two or more notes played simultaneously on different strings. Console steel guitars The console steel is any type electric steel guitar that rests on legs in a frame and is designed to be played in a seated position. The console steel usually has multiple necks—up to a maximum of four—each tuned differently. In the evolution of the steel guitar, the console steel is intermediate between the lap steel and the pedal steel. Pedal steel guitars The pedal steel guitar is an electric console instrument with one or two necks, each typically with ten strings. The neck tuned to C6 (Texas tuning) is closer to the player and the E9 (Nashville tuning) neck is further from the player. It may have up to ten pedals and a separate volume pedal, and up to eight knee levers are used to alter the tuning of various strings, allowing more varied and complex music than any other steel guitar. As an example, use of the pedals and knee levers in various combinations allows the player to play a major scale without moving the bar. The invention of the instrument was set in motion by the need to play more interesting and varied music that was not possible on previous steel guitars and to obviate the need for additional necks on console steels. Steels and slides A "steel" is a hard, smooth object pressed against guitar strings and is the reason for the name "steel guitar". It may go by many names, including "steel", "tone bar", "slide", "bottleneck" and others. A cylindrical-shaped steel with a bullet-shape on one end is typical in console steel and pedal steel playing. Lap steel and Dobro players often use a steel bar with squared-off ends and a deep groove for firmer grip. It has a cross section that resembles a railroad track. Another type of steel is a tubular object