Due to a software flaw from day one, a number of existing profiles feature a little too much energy in the region below 60 Hz, when compared to the original amp. The effect is very subtle and the basic character of the profile is generally not affected. Nonetheless, we have taken the opportunity to correct this with the latest firmware. The result is an increased authenticity, even of profiles created previously, and an improved performance - especially when played through a speaker system with a linear response down to the lowest frequencies, such as a PA, or studio monitor system.
Since we know that sonic improvements are not necessarily perceived as such by those who are familiar with the original sound, we have also added an option to compare the two versions, and to disable the correction if desired. Go to page 8 in the System Menu and activate softbutton “LFC Off”. It will illuminate to show the correction is disabled. If pressed again, the frequency correction will be reactivated. The correction (or its cancellation) will be applied globally, and not on a per-rig basis. Please be aware that a reset of global parameters (“Init Globals”) will bring the frequency correction back into effect. Profiles captured by this or future firmware version will take full advantage of this improvement. When you disable the frequency correction, this will only affect profiles created using earlier firmware version. In response to some users complaining about a lack of bass response when a tube amp is profiled, we have found a way to improve the profiling algorithm. You will notice that less effort is needed in the profiling refinement procedure, as well as a moderate improvement in authenticity, even without refining. Although this improvement also affects the bass response of profiles, it is not related to the improvement described above. Please note: this improvement will only affect new profiles captured by the latest firmware. Existing profiles and rigs will not be affected, and will keep the sound that you are familiar with."
подробнее про фичу
правда - на форуме пишут что облагораживает низ неплохо.....
народ доволен сильно , надо самому попробовать