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Comparing the Axe-Fx III to the Axe-Fx II

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Axe-Fx XL Plus front.png

What's new or changed

The firmware of the Axe-Fx III keeps evolving, introducing more and more features which set the Axe-Fx III apart from the previous generation(s). This page will not be updated with new firmware features for the Axe-Fx III.

For more information, read the Owners Manuals.


  • The III is taller, at 3U instead of 2U, but shallower, at 11.5” deep instead of 12.9”


  • The III has 4 independent stereo outputs, instead of 2, plus auto-switching front/rear instrument inputs with "Secret Sauce IV" and 3 stereo inputs. INs and OUTs can be used in the usual ways, or paired to insert outboard gear in up to 3 stereo loops
  • The red Output LEDs in the front panel meter bridge now light at -1 dBFS
  • Inputs 2, 3 and 4 support guitar impedance
  • The nominal level of Outputs 1 and 2 can be switched between -10 and +4 dB
  • Input levels for USB, AES and SPDIF

IMPORTANT: the Axe-Fx III's default output level is -10 dB (lower than the II: +4 dB)

User interface:

  • Instead of a RECALL screen, the III has a HOME button. The new Home menu provides access to Presets, Meters, with soft-button access to the Tuner, layout grid, controllers, and Setup menu
  • The III also has Performance Pages, allowing fast access to often-used and critical controls
  • Instead of a LAYOUT button, the layout grid is accessed from a soft-button in the Home menu, or by pressing ENTER, or pressing VALUE while on the Home page. The grid has new features like Zoom, CPU meter, and a "mini" tuner
  • You can use old familiar workflows with the NAV buttons and VALUE wheel, but you’ll move much faster through editing if you use the five Push-knobs under the display
  • The hardware and editor now optionally prompt before changing presets if the current preset has been edited. This prevents users from losing edits


"The Axe-Fx III has slightly more high end extension than the previous products. It's more accurate." source


  • New blocks include: Plex Delay, Ten-Tap Delay, Multitap Delay, Multiplexer, Realtime Analyzer, Scene MIDI block, IR Player
  • Authentic Tri-Chorus type in the Chorus block
  • 4 instances of Drive
  • 4 instances of Delay
  • 2 instances of Feedback Send/Return
  • Pitch block: 4 voices. Pitch block has its own (faster) pitch detector. Latency and stability has been improved. New Virtual Capo mode
  • Much improved Reverbs
  • Looper: more looping time, better control
  • Tone Matching in UltraRes, no difference between Offline and Live modes
  • Tuner: improved tracking, works on any (or: all 4) input
  • Compressor: "RMS" is the same as "Fast RMS" in the AX8 and Axe-Fx II. "E-L Panel" mode added. Filter parameter has been replaced with EQ-ing tools
  • Drive blocks: much improved. Higher oversampling ratio and double-precision filters in some places. GEQ added. Authentic controls. FASPICE technology
  • The output level of some effects / effects types has been changed, such as Resonator and Studio Compressor
  • Vocoder now has 24 bands
  • Some effects have their own envelope follower, such as Plex Delay
  • Improved noise gate in the Input block, now also includes EMI filtering
  • Stereoizer mode in Enhancer block
  • Improved Multiband Compressor
  • Wah has an GEQ
  • Multi Delay expansion
  • Auto Swell mode in Volume block
  • Bias and Harmonic Tremolo types
  • More Compressor types
  • Plex Reverb

Modifiers and controllers:

  • The Controllers block now has 4 channels, so the Envelope Controller can have 4 different settings per preset, for example
  • 4 Scene Controllers instead of 2
  • Damping (modifier menu) is replaced with Attack/Release parameters
  • To control the bypass state of a block using a modifier, you no longer modify the Bypass Mode parameter, but a dedicated Bypass parameter
  • A modifier can now be attached to either a single channel of an effect block, or to all its channels. You can't use a different modifier on a single parameter per channel

Presets, scenes, blocks and channels:

  • 14x6 grid instead of 12x4
  • 512 preset slots instead of 768
  • More CPU available per preset
  • Inputs and Outputs must be placed on the grid as blocks
  • Each Scene has its own customizable name
  • Up to 4 Channels per block (Multiplexer: 6)
  • Presets either default to a specified scene upon loading, or to the scene that was active when the preset was saved (global option)
  • 8 Global Blocks per effect block instance. Some blocks (like Multiplexer) do not support Global Blocks
  • Switching scenes is much faster

Amp modeling:

  • Additional amp models
  • "Ares" amp modeling
  • “Character” and "Pick Attack" parameters are gone
  • Pre-EQ controls have been added
  • "Boost types" have been integrated into the Amp block. These act as clean boosts replicating the oft-used “Drive on 0, adjust Level as desired” boost technique. This allows boosting the Amp block without requiring a separate Drive block. The "Boost Level" parameter controls the amount of boost
  • Output Mode lets you switch between FRFR and SS Power Amp + Cab
  • New Speaker Compliance parameter controls nonlinear behavior of the virtual speaker
  • New impedance modeling
  • FASPICE technology
  • Authentic controls

Cab modeling:

  • Mixes up to 4 different IRs at once
  • Output level is automatically normalized
  • Mic Modeling has been removed, "Proximity" remains
  • Speaker Size parameter is gone
  • There are now Factory 1, Factory 2, User 1 and User 2 banks, each with 1,024 IRs, and a Legacy bank containing all 189 IRs from the Axe-Fx II, and 16 Scratchpads
  • Two "IR Player" blocks
  • Different Slope settings for Hi Cut and Low Cut
  • Improved room ambience, with floor reflections
  • IR alignment

Editors, foot controllers:

  • FC foot controllers. Configuration on hardware or editor.
  • Editor software and foot controllers share control, updating each other seamlessly without re-sync issues or paused communications
  • FASLINK II (XLR-to-XLR) connects the Axe-Fx III to the new FC controller(s)
  • Axe-Edit III supports hi-res displays


  • Up to 8 MIDI PCs or CCs can be transmitted upon scene changes
  • A MIDI PC can be transmitted upon preset changes
  • A MIDI PC can be sent through the MIDI OUT port upon preset changes
  • The FC can send additional MIDI commands through Control Switches (similar to those on the FX8 and AX8)
  • The Bypass state of an effect can simply be toggled (no need to specify "0" or "128" when sending a MIDI CC), which is useful with MIDI controllers that don't send values along with MIDI CCs


  • No driver required for Mac computers
  • 8x8 USB Audio interface
  • Faster MIDI-over-USB
  • USB communications do not increase CPU load anymore

Powering on:

  • When powering on, the unit reads all user cabs. This happens in the background
  • The III shows diagnostics

What's gone

  • The MFC-101's "Axe-Fx Mode" is no longer supported
  • X/Y switching (replaced with Channels)
  • X/Y Quick Jump (soft knob on the Home page lets you jump to the Amp block)
  • Swapping presets on hardware (requires editor)
  • Certain hardware buttons like Effect Bypass (replaced with soft knobs)
  • Recall Effect function
  • Quad Chorus block (now available in the Multitap Delay block)
  • FX Loop block (replaced with Output blocks)
  • Cab block parameters: Mic modeling, Motor Drive, Speaker Size
  • Amp block parameters: Character, Pick Attack
  • MIDI phantom power
  • USB Adapter Mode

Comparing the effect blocks

Compare the effects in each device

The Axe-Fx II and Axe-Fx III cannot share presets electronically. Use FracTool to import Axe-Fx II presets into the Axe-Fx III.

Comparing the sound

"III is a little punchier. I really notice it when I A/B between the III and II (or the AX-8). If you plug into one and then plug into the other it's not as noticeable but if you use an A/B switch it's a more marked difference." source
”Everything sounds better. I think a big part of it is the quality of the I/O. The I/O measures flatter and less distortion than my $2000 interface.” source
"It actually does sound a little better. The extra DSP horsepower means that we didn't have to make compromises in some of the algorithms. The amp modeling algorithm is very similar but there's a few places on the II where we had to make compromises to get the algorithm to run within the allotted time. Also the III has a higher internal oversampling rate and a higher bit depth on some calculations (64-bit vs. 40-bit)." source
"Better algorithms, higher upsampling, better analog I/O design." source