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If you are talking about the standalone Amplitube app, as DarkStar says the answer is probably "no" (unless perhaps you have some way of routing audio output from a MIDI player to the Amplitube app).
However, if you are talking about using the Amplitube plugin within a DAW, then the answer would (or should) be "yes".
I often compose/record demos with MIDI in Logic Pro X, and I've set up my template and customized channel strips to use Amplitube as a plugin on my MIDI guitar and bass tracks. The results sound pretty decent, IMO.
^^^^ It all depends on what Gerry1943 meant by "MIDI bass tracks". I read it as a track with a MIDI item on it.
But, if he means MIDI notes that are sent to a Bass plug-in (such as MODOBass) to create some bass audio, then AmpliTube can certainly be used to effect that audio.
We await Gerry1943's return
---------------- DarkStar ... interesting, if true. Inspired by ...