they are normal voices apart from those specified as cool, sweet or live, see http://www.synthzone.com/ubbs/Forum37/HTML/004393.html for confirmation.

7000 has 9 live drum kits where the sympathetic resonance of the entire kit is recorded, including a couple of nice brush kits. All sounds are better through the internal speakers since these are improved, whether they are better though external speakers will depend on the external speakers I suppose. You may need pretty good PA speakers to hear the subtleties.