frequency setting slide control
/ˈfɹiːkwənsi ˈsɛtɪŋ ˈslaɪd kəntɹˈəʊl/
n
English · frequency setting slide control中文 · 频率调节滑钮Español · cursor de ajuste de la frecuenciaFrançais · curseur de réglage de la fréquence
意味：Sliding part used to tone down or amplify the sound signal associated with a given frequency band.