You might want to try the Personal Magnetism tape. I mention this because the tape has one think of a person with strong magnetic qualities, and I believe James Earl Jones qualifies as such a person. James Earl Jones also had a problem with stuttering.
The difference in the behavior generation between New Behavior Generator and Instantaneous Personal Magnetism is the way the modification is defined. IPM stops "leakages" (subtractive change), while NBG replaces or adds a behavior (generative change).
