The sound of your voice is VERY MUCH determined by technique/development!
https://www.youtube.com/watch?v=oantvO0vorQ
While there is some slight foundation for the idea that there is a "personal quality" in a given voice, this characteristic is rather the outcome of the psychological and emotional make-up of the individual than of the structure of his or her vocal apparatus, although this structure must, of course, have some effect. As it is generally understood, however, the "personal quality" is, in actual fact, merely the result of the particular, or personal, faults in technic. The technical equipment is so predominatingly the controlling influence in the quality characteristics of a voice that the other factors sink into insignificance." D. Stanley, Your Voice