An Instrument Track is basically just a MIDI Track and Aux Track combined. Before Pro Tools had Instrument Tracks you would create at least 1 MIDI Track (for your MIDI data) and route that to an Aux Track (which had your virtual instrument, like XPand). With an Instrument Track you can have everything on one track.
There are multiple ways to set up tracks and routing, but here are some basic guidelines...
Use an Instrument Track - Insert XPand on that track and record your MIDI data there. (If you want to record one part at a time then enable MIDI Merge in the Transport so that each record pass adds the new part instead of erasing the previous ones.)
Use MIDI Tracks with an Aux Track - Insert XPand on the Aux and route your MIDI Tracks to Xpand. If Xpand has a Drum Kit loaded, the parts (Kick, Snare, etc.) are on separate notes so you don't need to use unique MIDI channels for each part. If you have parts in Xpand that overlap keys (Piano on A, Strings on B, etc.) and you want to play different parts on them then use unique channels to keep them separate.
Check out the attached screenshots for some examples, and reply back if you have additional questions.
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