Re: how do you sit when you play the LP?
I usually play it in classical style (with the left leg proped up on something), like the picture above.
If I'm doing alot of riffing though I find that position kinda tiring, so I'll sit on the edge of a stool and let the guitar drop between my legs to the full length of the strap, so the guitar more or less is in "standing" position, even though I'm sitting.
Most of the time however I play standing up.