The NUX MG-300 MKII delivers authentic amp models, effects, and expanded functionality in a compact and versatile package.

Building on the success of the original MG-300, the MKII version introduces enhanced control over effect routing, Pro Scenes for instant tone switching, expanded user slots for third-party IRs, and much more. Powered by White Box modeling technology, the MG-300 MKII simulates analog circuitry with precision, offering 25+ amp models and 40+ effects. It includes bass amps & cabinets, a phrase looper, a drum machine, and an expression pedal for real-time control of effects like wah and volume.

Whether you’re practicing, livestreaming, or recording, the MG-300 MKII has you covered. The 1/8-inch TRRS jack supports headphones with built-in mics, while a dedicated mic output and gate controls let you blend guitar and vocals seamlessly. The USB-C port turns this modeler into an audio interface compatible with QuickTone Software Editor for total tone customization and easy firmware updates.

Your tone, your way

Tone chasers abound here so we regularly swap stompboxes and other effects in and out of our rigs and experiment with our signal chain order. With the MG-300 MKII, you can tinker with your effects and signal flows to your heart’s content without the extra hassle of physically moving effects around the floor. Better yet, the variations that modulation effects have both before and after the amp models behave in the same way as they do with their analog counterparts. The single output jack is a TRS jack for stereo operation, further expanding the sonic potential of the MG-300 MKII. For even greater flexibility, Block Switching allows certain effect blocks to be substituted for other effects. Whether you want to dual-stack overdrive and distortions to simulate a pedal platform style of amp or dive deeper into soundscape experimentation, you’ll find the perfect signal path.

NUX MG-300 MKII Features:

• Compact multi-FX and amp modeling processor for guitar or bass
• Color LCD with intuitive design
• 25 guitar amp and cab models, 1 bass amp with 8 bass cab models, and 3 acoustic IRs available for a wide variety of customizable sounds
• 24 open slots available for loading your favorite 3rd-party IRs
• Up to 3 Pro Scenes available to seamlessly switch effects parameters within a single preset
• Built-in looper and drum machine available for practicing or livestreaming
• TRRS 1/8-in. headphone jack accepts microphone and headset combos with dedicated mic and noise gate controls
• QuickTone Software Editor for Mac or Windows makes preset construction and editing simple and intuitive via the USB-C port
• Audio interface connectivity also available

Highlights

• TSAC-HD Pre-Effects and Amp Modeling deliver realistic feel and playability.
• Core-Image Post-Effects offer you studio sound quality.
• Quick Tone™ Edit Software for quickly choosing and tweaking patches.
• Load 3rd-party IRs to expand sound ability. USB audio stream for recording interface with routing setup.
• 56 drum beats and 60 seconds Phrase Loop Synchronization with Rhythm.
• Global 3-band EQ for quick adjustments in live applications.