lexicon omega four tracks simultaneously ubuntu studio

[hlblyhipy]

I just purchased a lexicon omega.So far I like using it,think it sounds great and seems to work with ardour.The problem im having is the lexicon is supposed to be able to record four tracks simultaneously.When i open jack i see only two capture ports,my thinking is i should see 4.Im new to this daw stuff so any help would be appreciated.While using the lexicon i get very little if any xruns and no errors.Thanx in advance for any help