open, and closed hi-hat strikes. Some modules, like the Roland TD-30, also feature foot close and quick close-open sounds, with pressure on the cymbals also being sensed and replicated when tightening or loosening the foot pressure, even on a closed hi-hat. So, the audio sounds tighter when firm pressure is applied on an already closed hi-hat pedal. Elements Sensors and pads The sensor-embedded pads and plastic cymbals are mounted on a stand or on multiple stands, so that the drummer can put them in the desired position. Drum module The electronic drum module is the equivalent to the synth module for electronic drums. It contains the electronic and digital circuitry which produces the synthesized drum sound or the triggered samples. The drum module has a number of faders, buttons and knobs on the front or top so that the drummer can make changes. There is usually some type of display, to give the drummer information about the settings and status. This may include an LCD or LED screen and individual LEDs that light up when sensors are triggered. The drum module is typically mounted on a stand, so that the drummer can easily reach it and see its display and other visual indicators. On the rear or top of the drum module is a patch bay, with a number of labelled jacks for plugging in the sensors, audio outs, and MIDI in or outs. Drum modules typically contain "drum kit" presets in their memory. Each drum kit has different sounds, such as jazz drums played with a "brushes" sound, rock drums, Latin drums, African drums, or 1980s-era drum machine synthesized drum sounds (like the TR-808 kick drum sound, for example). Some electronic drum modules, such as Roland's TD-12, even include non-drum sounds, such as organ, electric bass, orchestra, and so on, which can be triggered using the drum kit sensors. Some presets also include effects appropriate to the drum kit or its associated genre. The drum module may also contain effect units, such as audio compression, reverb, and equalization. The drum module may offer controls to adjust the sensitivity of the different pads and cymbals, change the sound of the tuning of the drums, adjust the "buzz" of the snare, the muffling of the bass drum, and so on. Some drum modules incorporate features of drum machines or sequencers, such as the capability to play pre-programmed drum beats, so that