Hi,
I think that's it. If you mean "Line 6 AmpFarm" then you are right: this is all you can get on TDM. But Amplitube is online running as a RTAS plug here. It sounds really great but the latency is so high that you cannot use it to record directly. I am using SansAmp and AmpFarm therefore.
By the way: SansAmp has a little bug in OS9, that it mutes the channel when you open a previously recorded session. Workaround: If you click the SansAmp-plugin the channel all of a sudden will be unmuted. Don't know why...
Best,
paule.