But when I do this and assign a sax, for instance, to channel 4 (which I understand is the melody channel normally used by BIAB), I do not hear any sax on songs I know have a melody. If I am understanding correctly (and please keep in mind I am very new to midi), Jazzman is saying that BIAB should still stay on channel 4, but I have to change something within JABB (from whatever JABB currently uses as its melody channel to channel 4). Is that correct? If so, how do I do this?

Further to Jazzman's point, I have the midi mapping in BIAB (under opt/audiomidi setup) set to General Midi Misc., which BIAB said should be usable for all sound cards. I only saw one Native Instruments choice there, and it was not for JABB or Kontakt2. Is there a map specific for JABB available that I can download?