Yeah the documentation is abysmal. But, judging from YT reviews I believe this is Joyo's take on the Revv G3.
This was a very thorough review of it:
The knobs are quite sensitive and do a lot. I wouldn't call it "versatile" as in it won't do low to medium gain stuff very well as far as I could see (I spent only 15 mins or so with it), but for heavy metal / metal / high gain chug stuff (ala Tool, Metallica etc.) It does amazing IMO.