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Firmware 7.00 for the Axe-Fx II has been released. Below are the release notes.

Click here for the complete list of Release Notes for the Axe-Fx II.

7.00 Release Notes:

  • The dynamics processing of the amp block was totally rewritten for this release. A complex set of formulas was developed that completely describe the various voltages in a tube amp. Unlike other modelers that simply model an amps dynamics as a first-order compressor, the Axe-Fx II now accurately models the complex interaction of the power tubes with the surrounding circuitry including the power supply and screen voltage network. You may notice a difference in the feel of the various amp models. Please refer to the descriptions below to understand the operation of the various controls. Doing so will enable you to adjust the dynamics to your personal preferences.
  • Added compression modeling to amp block preamp section. A new parameter, “COMP”, controls the amount of compression. Most models default to zero as they do not have measureable compression. Other models have a non-zero default value which matches the amp’s preamp compression characteristics. The time constant of the dynamics can be set in the Advanced menu with the PREAMP DYN TIME parameter. Preamp compression can be used to emphasize pick attack which is useful for certain musical styles. Use caution when dialing extreme values as this can cause excessive pumping.
  • Improved preamp modeling. Harmonics now move more with input level which results in a more open and less congested tone.
  • The DYNAMICS control in the Amp block now allows negative values. Negative values cause dynamic range expansion while positive values work as before and cause dynamic range reduction. Use caution when dialing in extreme values as this can cause unwanted distortion.
  • Note that there are two dynamics controls for the power amp section. SUPPLY SAG controls how much the virtual power supply sags. This is a complex interaction between the master volume (MSTR), transformer matching (XFRMR MATCH) and screen network. Depending upon the amp you may even feel the screen voltage bounce if the screen network is underdamped (amps with chokes can often be underdamped). The screen network parameters are automatically set when the model is selected and cannot be altered by the user. DYNAMICS is an idealized dynamic range processor which controls the power amp response independently of the aforementioned parameters although it is still somewhat dependent on master volume. In general, the more heavily driven the power amp section, the more effect the SUPPLY SAG and DYNAMICS controls have.
  • Removed matching data from some of the amp models because the new algorithms make it unnecessary.
  • Added “Herbie” amp models based on a Diezel Herbert.
  • Added “Dizzy” amp models based on a Diezel VH4.
  • Added Friedman Dirty Shirley amp model.
  • Added “Division13 CJ” amp model based on Divided by 13 CJ11.
  • Added “Solo99 Rhythm” amp model based on Soldano X99 Crunch channel.
  • Added “Sure Weasel” amp model based on a Suhr Badger
  • Added “Spawn Fastrod” amp model based on Splawn Quickrod.
  • Added “Prince Tone 2” based on a Fender AA964 Princeton. This particular amp is an early CBS “Silverface” but still using pre-CBS design and components.
  • Replaced the “Brit 800 Mod” model with “Brit Super” based on a Marshall AFD100.
  • Tweaked the gain in many amp models to compensate for new modeling and make more accurate.
  • Exposed the bias point of the last tube stage in the preamp modeling. This parameter, called PREAMP BIAS, sets the bias point of the last triode (cathode follower not counted). Depending on the bias points of the previous stages increasing or decreasing this value can alter both the harmonic content and the attack characteristics. Typically, if the previous stage has a negative bias then increasing this value will be more noticeable and vice-versa. This value is set to a default value for the model whenever the type is changed but can be overridden by the user.
  • Added six new cabinet models from the excellent Kalthallen collection. Please visit to download more and please donate to the maker if you enjoy these.
  • Added Sample Rate Reduction to Drive block. This allows intentional aliasing which can be used for creative effects.
  • Improved Reverb block. The Reverb block has two new parameters: LF TIME and LF XOVER. LF TIME controls the decay time relative to mid-band. LF XOVER controls the crossover frequency to the low-frequency decay. Many real rooms have a longer low-frequency decay time relative to mid-band. These controls allow more natural reverb simulations. The Types in the Reverb block have been reworked due to the new algorithms. As such, for best results you should reset the Reverb block by deselecting and then reselecting the desired type.
  • Added “Vintage Tape” type to Chorus block. This type uses the tape delay algorithm used in the Delay block as the basis for the chorus effect. Note that this type sums the left and right block inputs into mono so use caution as stereo cancellation may occur.
  • Added tone control to Phaser block. This affects only the wet signal.
  • Added “Esoteric RCB” drive model based on Xotic RC Boost.
  • Added “Zen Master” drive model based on Hermida Zendrive.
  • Added RATIO parameter to Ping-Pong mode in Delay block. This allows altering the ratio between the left and right times to something other than the usual 50%.
  • Added REF SOLO parameter to Tone Matching block. When set to “ON” the reference source is sent directly to the block output. This allows easily switching between the reference source and the matched signal for comparison. It is recommended to connect an external controller (i.e. footswitch) to this for ease in switching between the signal sources. NOTE: when Ref Solo is active the Layout menu will flash a message so that you know when you are listening to the reference source.
  • Added STRIP ALL GLOBAL DATA function to Utility-Preset menu. This function removes all Global Block associations from a preset. This is useful when downloading presets created by others that use Global Blocks. Running the function will strip the Global Block links but retain the sound of the preset as the author intended as that data is embedded in the preset.
  • Added Global Block message to Recall menu. When a preset is loaded that contains Global Blocks, a message will appear indicating so. You can remove all links to Global Blocks by pressing Enter.
  • Preset name functionality in the Store menu has been changed as follows:
    • X: Insert a character at the current cursor position.
    • Y: Delete the character at the current cursor position.
    • A: Select an upper-case character.
    • B: Select a lower-case character.
    • C: Select a number.
    • D: Move the cursor.
    • < >: Move the cursor.
    • Value: Select any character from the character set.
    • This behavior is also extended to the IR Capture utility.
  • Improved Tuner Stability.
  • Fixed Tone Matching data not being copied properly when using Recall->Effect.