This popped up today in my YT suggested videos. Pretty thorough. I suggest watching on YT and not just here so you can skip to the sections you want to hear.
I had no idea who he is. With a little research, his name is Alexander Varganov from Novosibirsk, Russia (Siberia), three of the basses are for sale on Reverb and he also sells the preamp and drive pedal.
My favorite by far is the '97 LPB-3, which is actually a '96. It's noticeably darker and I like that. YMMV of course.