NUX releases MG-400 GEN2 firmware 3.0.3 for MacOS
August 28, 2026 · 1 sources
NUX released MG-400 GEN2 firmware version 3.0.3 for MacOS on August 28, 2026, according to the MG-400 product page1. The update is installed over USB using NUX's NMP (NUX Multi-Effects Software)1. NUX states the GEN2 firmware is only compatible with the GEN2 version of its QuickTone editor software1.
The update adds four WAH types. Holding the PEDAL button switches the MG-400's built-in expression pedal to WAH mode, and NUX says the selection covers "the full spectrum from classic Cry Baby character to modern wide-band WAH"1. The AMP block gains a dual-engine architecture: three Deep Image amp models, which NUX describes as its proprietary DSP-based modeling technology, plus ten NAM Loader slots for community-shared Neural Amp Modeler .nam files, with A2-Lite native and A1 convert formats1. Five new Deep Image effects are added to the EFX block1.
The EQ block's MODE page now shows real-time dB values for each band1. Holding the TAP button opens direct BPM input, settable from 40 to 240 BPM1. A Global TAP toggle in SYSTEM MENU, under PARA. FOLLOW, syncs the tap tempo across all presets' delay and modulation effects when enabled1.
"Firmware updates shouldn’t be footnotes. MG-400 GEN2 is a direct answer to how working guitarists actually use a multi-effects processor on stage and in the studio, from WAH control logic to amp modeling depth to global tempo management."
The MG-400 is a multi-effects unit with two DSP chips running NUX's TS/AC-HD White-Box Amp Modeling algorithm and Core-Image post-effects1. It has 10 movable signal blocks, 512-sample IR resolution with a user slot per patch and 12 additional IR collection slots, a 2.8-inch 320x240 color LCD, scene functionality and a phrase looper1. NUX calls it "the best value modeler for the money"1. The page lists no price for the MG-400 or the firmware1.
Sources (1)
- MG-400 - NUX Audio, nuxaudio.com