Input——Line input, generally refers to connecting the output of the audio cable of the guitar or bass to here; Volume——Adjust the volume; Equalizer——Equalizer, used to adjust frequency compensation and attenuation; Bass-low frequency, usually refers to the frequency below 1000Hz; Middle——Intermediate frequency, usually around 2000Hz; Treble-high frequency, usually above 6000Hz; Tone Shift-tone conversion; Overdrive-overload; Gain-gain; Overdrive Contour——Overload contour; Level——Level; Power Dimension——power degree; Reverb-Reverb; Line Out——Line output; Phones-connect headphones; Fuse-fuse Vacuum Furnace Insulation Tube Vacuum Furnace Insulation Tube,Small Carbon Fiber Tube,Bare Felt Square Cylinder,Bare Felt Square Carbon Fiber Tube HuNan MTR New Material Technology Co.,Ltd , https://www.hnmtr.com