Articulation and Tone
Generally speaking, controlling bends and articulations further back in your mouth will give you a rounder/warmer tone. When articulating, the "K" articulation will help you to achieve a warmer tone (before and after the articulation) than the "T" articulation. You CAN achieve a good tone with "T," just make sure that the middle and back of your tongue is lowered so that you create a tone chamber behind the articulation. But, generally speaking, the more you use "K" or "G" (G is softer) the more of a chance your tone will be bigger.