About the ULTRA model
The Axe-Fx UltraTM is a “souped-up” version of the Axe-Fx. All the same great sounds but with a faster DSP and more memory. The UltraTM contains a large selection of effects and sub-algorithms not present in the regular Axe-Fx and is geared toward serious studio and live use. The Ultra is equally at home in a FOH or studio effects rack as it is in a guitar rig. Features exclusive to the Ultra model are indicated as such through this on-line manual.
Refer to the feature comparison table for differences between the Axe-Fx and the Axe-Fx Ultra.
Axe-Fx Ultra DSP
The Axe-Fx Ultra edition uses the TigerSHARC ADSP-TS201S, which runs at 600MHz and has 24Mbits (3MBytes) of on-chip memory, which no other DSP's to date have offered.