Drum bags are made from robust cloth such as cordura or from cloth-backed vinyl. They give minimal protection from bumps and impacts, but they do protect drums and cymbals from precipitation. They are adequate for drums transported in private vehicles to go to local gigs and sessions. They are often the only option for young drummers who are just starting out.
Most bass players stand while playing, using a strap over the shoulder to hold the instrument, although sitting is also accepted, particularly in large ensemble settings, such as jazz big bands or in acoustic genres such as folk music. Some bassists, such as Jah Wobble, alternate between standing or seated playing. It is a matter of the player's preference as to which position gives the greatest ease of playing and what a bandleader expects. When sitting, right-handed players can balance the instrument on the right thigh or like classical guitar players, the left. When sitting, no strap is required. Balancing the bass on the left thigh usually positions it in such a way that it mimics the standing position, allowing for less difference between the standing and sitting positions. Balancing the bass on the right thigh provides better access to the neck and fretboard in its entirety, especially the lower-pitched frets.
Optical pickups are another type of non-magnetic pickup. They use an infrared LED to optically track the movement of the string, similar to the mechanism of modern computer mice, which allows them to reproduce low-frequency tones at high volumes without the "hum" or excessive resonance associated with conventional magnetic pickups. Since optical pickups do not pick up high frequencies or percussive sounds well, they are commonly paired with piezoelectric pickups to fill in the missing frequencies. LightWave Systems builds basses with optical pickups.
On modern band and orchestral drums, the drumhead is placed over the opening of the drum, which in turn is held onto the shell by a "counterhoop" (or "rim"), which is then held by means of a number of tuning screws called "tension rods" that screw into lugs placed evenly around the circumference. The head's tension can be adjusted by loosening or tightening the rods. Many such drums have six to ten tension rods. The sound of a drum depends on many variables—including shape, shell size and thickness, shell materials, counterhoop material, drumhead material, drumhead tension, drum position, location, and striking velocity and angle.
Since there are so many digital pianos worthy of your attention in this catalog, you may want to narrow down your choices using some of the search options on the sidebar. For example, if you select stage digital pianos under the category section, you'll be presented with all the digital pianos that were made for the stage. Once here you have the opportunity to drill down even further and can search by topics like number of keys, MIDI/USB Connections or by whether or not the digital piano has built-in speakers.