MeasureAudio.cs

        private float AnalyzeSound()
        {
            float[] samples = new float[1024];
            this.audioSource.GetOutputData(samples, 0); // fill array with samples
            float sum = 0;
            for (int i = 0; i < 1024; i++)
            {
                sum += samples[i] * samples[i]; // sum squared samples
            }
            return Mathf.Sqrt(sum / 1024); // rms = square root of average
        }