Vocal dynamics are the variations in loudness and intensity of the voice when speaking or singing. They can also refer to the use of vocal inflexions and pauses to create expression and emotion.

Here are the 5 tips to improve your control over vocal dynamics

1. Learn to use breath control: Practice breathing deeply from the diaphragm and controlling your breath when singing. This will help to improve your vocal dynamics and control. 

2. Practice with Riyaz App with the metronome: Practice on the Riyaz app with the metronome will help you to stay on beat and keep a steady tempo. It will also help you to understand the nuances of dynamic control. 

3. Listen and mimic: Listen to singers who have mastered dynamic control and mimic their techniques. This will help you to understand what sounds good and how to replicate it.

4. Experiment with dynamics: Take time to experiment with different dynamic techniques such as crescendos, decrescendos, and other techniques. This will help you to understand and control dynamics better. 

5. Record yourself: Recording yourself while you practice will help you to hear and identify areas where your control of dynamics needs improvement. Listening back to yourself will also help you to make any necessary adjustments.