In the 1970s, chordal instruments such as the electric and/or acoustic guitar and various keyboards (piano, electric piano, Hammond organ, clavinet) continued to be used to augment the bass and drums in soul, funk, and reggae groups. The sound of late 1960s and 1970s rhythm sections was often given a unique tone and sound due to the use of effects units. Funk bass players would play through auto-wah or envelope follower pedals. Reggae guitarists would plug into echo pedals. Rock guitarists would run their electric guitars through distortion and wah pedals. Electric piano or clavinet players also used effects.