The name is long, but basically, it's a blender that allows you to mix the sound of an effect pedal connected to a loop with the original sound by your preferred amount. It's a single unit that allows you to blend various effect pedals and create original sounds. Product Overview 9VDC INPUT: 9v center negative, just like a regular effect pedal. BLEND KNOB: As you turn it to the right, the effect pedal sound (WET) is mixed in. Turning it all the way to the right allows you to use it as a regular 1LOOP switcher. INPUT JACK OUTPUT JACK OUT TO LOOP (SEND): This is the send. Normally, connect this to the input of the effect pedal to be blended. IN FROM LOOP (RETURN): This is the return. Normally, connect this to the output of the effect pedal to be blended. POLARITY SWITCH: This switch changes the phase when blending. Set it to the position where the sound sounds natural. BJF BUFFERSWITCH: Turns the BJF Buffer ON/OFF. When ON, the BJF Buffer is always ON, including when bypassed. When OFF, it's true bypass when bypassed, and a standard buffer is applied when ON. EXPRESSION PEDAL INPUT: Connect an expression pedal to control the BLEND KNOB with the pedal. KORG XVP-10 is recommended. *Please use a stereo cable. FOOT SWITCH: Selects the effect pedal ON/OFF. The OneControl Marquee Blaster Expression is a high-quality guitar effect pedal equipped with a BJF buffer. It provides a clear and dynamic sound without compromising sound quality. With its user-friendly design, you can easily adjust the sound with the intuitive DRY/WET knob and bypass switch. Its compact size makes it ideal for guitar boards. 【Multi-functionality】 The POLARITY switch allows for flexible use depending on the connection environment. It supports various musical styles, making it widely used by professionals and amateurs alike. Especially recommended for eccentric bassists! Comes with the box and is almost unused. It's in great condition.