HSY (HSY-400G) 4-Band Tone Controls EQ Equalizer With Colorful digital Tunner

4Band-Equalizer with Chromatic Tuner for Electric Bass guitar. When pushing the Tuner Switch, the It becomes a Pedal Tuner. You can choose True Bypass or Tuner system with Foot Switch. When tuning, the noise is perfectly blocked by Low-Impedance Mute of output. When pull up the Tuner Switch, this becomes a 4 band-Equalizer. You can choose Bypass or Equalizer system with Foot Switch