c# Implement Speech in Noise

I have to implement speech in noise i.e a normal sentence spoken in a noisy background. Eg. A person introducing himself with a music being played in his background. I have the person's introduction audio and the background music audio separately as 2 Wave Files and i want to play it at 10 dB SNR and for 4 different peoples but with same background music.

How do I achieve this using c# ?