thanks guys
the plug ins lists were very useful, although I obviously know whats in X2. It would seem that session drummer 3 is not in bandcamp.
It looks like the current bunch of interfaces are all usb so I think I'll have to do some digging around for usb3 offerings that have latency like the layla 3g.
I will get a new interface and continue with X2 for a while. I have never used anything in the last 8 years that has exposed any of the bugs so there is nothing urgent forcing an upgrade.
thanks again.