Rockville G-AMP 40 Guitar Amplifier 10" Speaker/Bluetooth/Mic in/USB/Footswitch,Black

Controls:. Master volume (adjusts the volume on all channels). Guitar volume. Bass (adjusts low frequency on both channels). Mid (adjusts mid frequency on both channels). Treble (adjusts high frequency on both channels). Effect (Turn the knob to select Chorus, Flanger, Phaser, Tremolo). Delay/Reverb (turn to select delay or reverb and intensity). Gain volume (functions when the Drive channel is selected only). Reverb volume (Spring reverb ,adjusts the reverb level on both channels).