Two complete different overdrive in one pedal: Tubeman MKII + Morning Star Versatile routing: you can adjust the order as MS->TM or TM->MS Toggle switch for Buffer-Bypass or True Bypass Toggle switch for 9V/18V: get more dynamic FAT function on TUBEMAN MKII adds bass response and warmness SHINE function on Morning Star adds treble and clarity External Switch to remote the pedal via external foot controller