high-end, expensive keyboards and workstations, this feature allows the performer to emulate digitally-modeled sounds of a tonewheel electronic organ (hence drawbar). It consists of nine editable virtual sliders that resemble the drawbars of a tonewheel organ, and features various effects such as rotary speaker, percussion, and tremolo. The setting can be saved to the keyboard's user memory or storage device. Piano simulation: A common feature of the digital piano, stage piano, and high-end workstations that allows real-time simulation of a sampled piano sound. It provides various piano-related effects, such as room reverberation, sympathetic resonance, piano lid position (as on a grand piano), and settings to adjust the tuning and overall sound quality. Keyboard action describes the mechanism and feel of the keyboard. Keyboards can be roughly divided into non-weighted and weighted. Non-weighted keyboards has a light, springy feel to their keys, similar to the action of an organ. The least expensive keyboards, often with non-fullsize keys, uses keys that are mounted on soft rubber pads that also acts as electronic switches. Most electronic keyboards use spring-loaded keys that make some kinds of playing techniques, such as backhanded sweeps, impossible, but make the keyboards lighter and easier to transport. Players accustomed to acoustic piano keys may find non-weighted spring-action keyboards uncomfortable and difficult to play effectively. Conversely, keyboard players accustomed to the non-weighted action may encounter difficulty and discomfort playing on an acoustic piano. Weighted keyboards indicate that some kind of effort has been made to give the keyboard more resistance and responsive feel similar to that of an acoustic piano. Semi-weighted keys is a term applied to keyboards with spring action like a non-weighted keyboard but that have extra weight added to the keys to give them more resistance and responsive feel. Hammer action keys uses some kind of mechanism to replicate the action of a mechanical piano. This is often achieved with some kind of lever mechanism connected to the key. Graded hammer action keys does what hammer action keys do, but also has a different feel on the low versus high notes as on a mechanical piano keyboard. The lower note keys have a higher resistance than the higher note keys. MIDI controls MIDI, Musical Instrument Digital Interface, is a serial data connection which operates with any make or model of instrument which provides for it. Electronic keyboards typically use MIDI signals to send and receive data, a