Heya many thanks JD.
1. It's the stock speakers. Greenbacks on top, V30's on bottom.
2. Channel 2 is in Clip Mode. That's modded Marshall territory and that's where that channel stays for me. Righteous tones all across the gain range.
Channel 3 is in Lead Mode. I like Crunch Mode too, but Lead Mode just has a thick syrupy sweetness to it that suits lead playing perfectly. Makes for a nice contrast to the leaner tones of Channel 2 in Clip Mode.
3. Channel 2 Feel is on setting #6. I prefer a bit of sag on my lower gain Marshall-type tones.
Channel 3 Feel is on setting #3. I find any higher is a bit too stiff for my preferences. And #3's mids sound the nicest to my ears.
Feel Knob is subtle in how much tighter the sound gets, but has a more noticeable effect on how the mids sound. But it seems to mostly affect how the amp feels. I do prefer an amp that's fluid feeling rather than stiff, hence my tendency to go lower on the feel settings.
4. I had the Master well below 1/4. It wasn't even past 7 o'clock, so I barely had the power section working. I was using the Channels' Level Controls to bring the volume up. When I first got the amp, I pumped the Master up for a few chords and rattled the walls. It can sound monstrous.
5. It's a quiet amp. In the vid you can only hear a noise floor when I hit the front end of Channel 3 with the Koko Boost. And that's with Channel 3's Gain Control set very high. My Koko Boost is a noisy pedal and always introduces noise into the signal. It was much worse through my Peters and Landry amps. The Driftwood and KSR are much quieter amps.
6. Well I have to say it's my fave thus far, with the Driftwood Mini Nightmare a very close 2nd. I'd say the KSR has the edge in tone, whereas the Driftwood just has the best feel of any amp I've played. Mind you the KSR isn't far behind in feel. Haha.
Hope that helps man.