Vocal Tips: Here's something that many of you might find useful. I recently wrote this response to an article by a voice coach, dealing with the "mask," or the use of sinus resonance in speaking and singing:
Of course, it is important that people hear themselves correctly. The article mentioned bone conduction (soft tissue is also a factor) and how we tend to sound different to others than to ourselves. Part of this is the mentioned conduction, but other factors include directionality of sound and reflection/reverberation. Lower sounds tend to be both omnidirectional and less absorbed by the body, leading to greater ease in hearing those frequencies. Higher sounds are more directional (in this case away from the self-listener) and more absorbed by the body tissues, leading to less conduction to the ears. So, folks with lower or higher voices will be affected differently.
Listening to oneself can be enhanced by having a reflective surface, but without too much reverberation. Recording and playing back one's voice with a reasonable sounding microphone and playback system can provide very valuable feedback. Cupping one hand in front of the mouth, about a palm's distance away, and the other behind one ear can also improve self-hearing.
Many people find that their voices are either too quiet or "dry," meaning they lack sinus resonance, a problem often related by voice professionals to the concept of the "mask." Or, they may be too nasal, the opposite problem.
Vocalists can easily learn to correct these problems. Here's my approach: First, close your eyes. When doing these exercises, use your mind's eye, your kinesthetic sense (internal feeling) and your ears to provide the audio feedback.
Sing a note in your low midrange, mouth open. Now, continue the sound as you close your mouth. Automatically, the nasal port will open, providing an outlet for the sound. Using the three senses mentioned above, try to locate exactly where this is happening, and memorize the location and the feeling. Now, stop the sound WITHOUT stopping the airflow from the lungs, and without jamming the back of the tongue into the nasal port, and without closing the nostrils. When the nasal port closes, you'll feel the pressure of the airflow from below. This is similar to the sensation of blowing air through the mouth with the lips nearly closed, ballooning them a la Dizzy Gillespie. Of course, don't use excessive airflow, and pop your ears!
Again using the same three senses, find the muscles that you are using to stop the sound. This is teaching you to isolate and control the velum/nasal port. Most people can do so after only a few attempts. Now, release the same tissues, and you'll snort as the air is released via the nostrils.
Once you have successfully isolated the nasal port, I recommend practicing opening and closing it with various rhythms. This will really build quite an amazing amount of control over the nasal components of your voice! You'll notice that it's not just a matter of the nasal port being open or closed, but that there can be degrees in between. It becomes easy to do this in differing tempos and meters. Of course, learning to open and close the velum in triplets and dotted eighth notes isn't important for most vocalists, but it's basic technique in certain throat-singing styles.
Another major part of the puzzle is the position of the tongue beneath the nasal port. Both distance from the nasal port and the direction at which sound is directed up into the sinuses effect the tonality of the voice.
I've had students that spent many weeks and even more $$ with voice and theatrical coaches, trying to modify the sound of their voice. These techniques that I've shared cost nothing more than a few minutes of trying, and then a little regular practice.