I don't think it was the Ulltras, we got ours from someone we stood next to in E3 and is now in N4. The Ulltras are towards the back of N2. Most of the singing comes from Tigerfiley in N4. Sometimes we start songs in N3 and occasionally it comes from N2.
Just checked, the Ulltras don't know if they're renewing for next season, but if they do, they plan to move to N5.
I stand in the middle of N4 - it can be good when the crowd get's going, but it's nowhere near as consistent as it was in E2 - where I had the Ulltras a few rows behind me, and the Driff Tigers in front of me. I've not seen any of those faces this season around me, other than outside the ground when we're all held back. Some of the chanting starts in N4, but quite a bit seems to come from N2/N1-ish. As I said before - most of the people around me, including my 3 friends that I attend matches with have all decided not to renew. My friends have said it would take a huge change of heart (and stance from the Allams) to renew, and then it would probably be for East stand.