2 questions please:

1) How do I know if I entered focus 3 stage? Brain and mind are in sync - what exactly is that?

(Since years I have been into pranayama, locks and find resonant tuning similar to ujjayi pranayama)

I did resonant tuning and cleared my mind from thoughts. Is that the focus 3 state?

And thanks to the Gateway, I find this awesome experience. Before this I have been trying many binaural and isochronics, but I find this special and useful because of the exercies and visualization

2) Can I reach the focus 10 state while sitting? I easily entered focus 10, body asleep and mind awake while lying down, but did anyone reach focus 10 while sitting with spine, head erect?