Check the listing for details. NUX MG-400 Dual DSP Modeling Guitar Bass Effect Processor Pedal - NO ADAPTER. Condition: Used, Made in China. Listed at 180.00 USD. The NUX MG-400 Dual DSP Modeling Guitar Bass Effect Processor Pedal is a versatile and high-quality pedal designed for guitarists and bass players. With its dual DSP modeling technology, this pedal offers a wide range of analog and digital effects for creating stunning and dynamic sounds. It is compatible with acoustic electric guitars, electric guitars, and bass guitars, making it a versatile option for a variety of musicians. The NUX MG-400 is a great choice for adding depth and character to your sound.