If you find that you are creating a nasal quality when you sing, it is possible you have a ‘nasal leak’. This is when the soft palate does not raise completely when you sing, and air leaks through the nasal passages.
Have you got a nasal leak?
Take a small mirror and place it under your nose when you sing. If you find a little condensation on the mirror, you have a nasal leak.
What can I do about it?
You need to introduce some soft palate lifting exercises to your vocal workout. Sing scales or any musical pattern to ‘ka’ and ‘ga’. Build up speed and repetition.
Building this into your exercise routine will sharpen up the soft palate lifting muscles, which will help close off the leak. This will reduce nasality in your sound.