Quick review.
- Impeccable construction. Sturdy, smells like reliability. Wide pedal course.
- Incredible ergonomy. There are tons of functions but you still quickly understand everything without the manual. There are a lot of backlights and LEDs to guide you. For example, on a given effect, only the useful knobs are backlit, on the others the light is off. Each setting name appears in letters on the LCD screen with physical parameters and units, not just vague numbers. It speaks in ms, dB, Hz, etc.
- The insert goes between pre-fx and modulations so you can insert a preamp there. You can blend it with clean signal.
- Stock presets are crappy as can be. Don't trust them to define the unit. Half are space station burbs, the rest is badly adjusted patches.
- There's an Individual mode that allows you to use each section as a separate pedals with all parameters instantly adjustable by knobs. Great to build your sounds or real-time tweaking.
- In Program mode there are 24 banks, browsable with up-down buttons and 4 patches in each. You can navigate from any patch to another without a glitch. There's about a 1/8 s glitch between program changes but not when they're in the same bank.
- A Control footswitch allows additional functions to be applied to any patch. The Expression pedal can be affected to any parameter with up and down limits. There's a switch at the end of the course.
- The ESS system is a blast. A bit difficult to explain. you can choose any parameter on any effect and program 8 different settings for it. You can then automatically run sequences of settings based on the patch, at a given speed (or control speed with the exp pedal or tap). They can go straight through the steps, backward, random etc. With a filter, you get a Murf style effect. With a pitch shifter, it's an arpeggiator. On echo tape time it sounds like a gliding Moog. Endless possibilities, crazy stuff but a lot of programming to do. It really is a brilliant innovation.
- The pre-FX section offers a bit of everything, so you can have 2 modulations going at the same time, for example.
- EQs, modulations and time effects are excellent, as usual with Korg. The Swell is the most musical I ever heard. Awesome choice of delays. Infinite feedback available. 2.7s looper with overlayering, play over loop, control of input and/or output. Tap delay.
- Synth tracks fast but is limited in use and far from great. Single oscillator, single filter.
- Filters are way cool and offer several interesting tones. Wah is good, with proper tweaking it should be great.
- Distortions are so-so, good lows, lots of settings but not much personnality. Models are your typical Pandora / AX-10B tones, just much more punchy.
- Compression is simplistic but very efficient. Limiters offer more settings. The Korg Exciter still works like a charm.
- The Bypass isn't. it doesn't really degrade the tone but definitely colors it. Not a hint of hiss/hum even on extreme settings.
I expected more, probably too much. I'm still very impressed by some of the functions in this box. Synths won't replace my Akai and I'm not about to ditch the Fulltone.
For now I won't buy it but if I didn't own any effect and wanted a great collection, it would be at the top of the list. Finally a valuable replacement for my old AX-1B. It blows away the GT-6B in each and every section I can think of. Now, there's a GT-8B in the tubes.
For uromites, there's a promotional offer on Thomann right now, it goes for 299 with a gigbag.
theres only one distortion on there that is actually decent... all the rest sound weak and horrible 
