Later funk basslines use sixteenth note syncopation, blues scales, and repetitive patterns, often with leaps of an octave or a larger interval. Funk basslines emphasize repetitive patterns, locked-in grooves, continuous playing, and slap and popping bass. Slapping and popping uses a mixture of thumb-slapped low notes (also called "thumped") and finger "popped" (or plucked) high notes, allowing the bass to have a drum-like rhythmic role, which became a distinctive element of funk. Notable slap and funky players include Bernard Edwards (Chic), Robert "Kool" Bell, Mark Adams (Slave), Johnny Flippin (Fatback) and Bootsy Collins. While slap and funky is important, some influential bassists who play funk, such as Rocco Prestia (from Tower of Power), did not use the approach, and instead used a typical fingerstyle method based on James Jamerson's Motown playing style. Larry Graham from Sly and the Family Stone is an influential bassist. Funk bass has an "earthy, percussive kind of feel", in part due to the use of muted, rhythmic ghost notes (also called "dead notes"). Some funk bass players use electronic effects units to alter the tone of their instrument, such as "envelope filters" (an auto-wah effect that creates a "gooey, slurpy, quacky, and syrupy" sound) and imitate keyboard synthesizer bass tones (e.g., the Mutron envelope filter) and overdriven fuzz bass effects, which are used to create the "classic fuzz tone that sounds like old school Funk records". Other effects that are used include the flanger and bass chorus. Collins also used a Mutron Octave Divider, an octave pedal that, like the Octavia pedal popularized by Hendrix, can double a note an octave above and below to create a "futuristic and fat low-end sound". Funk drumming creates a groove by emphasizing the drummer's "feel and emotion", which including "occasional tempo fluctuations", the use of swing feel in some songs (e.g., "Cissy Strut" by The Meters and "I'll Take You There" by The Staple Singers, which have a half-swung feel), and less use of fills (as they can lessen the groove). Drum fills are "few and economical", to ensure that the drumming stays "in the pocket", with a steady tempo and groove.