I'm with you on the quiet voice. A few years back a psychologist in a training session said "speak up" and then went on in front of the class of 50 to ask when in my life had I not had a voice. She knew nothing about me except I had a quiet voice!!! Yet she was spot on as I had kept silent for many years. Since then I've learned to consciously speak up louder in situations that I used to have a very quiet voice. It's certainly worked for me although at times I slip back into a quieter voice but I am aware of it and then alter my voice.