WaveCutOff

private int DataOffset(byte[] data)
        {
            int offset = 0;
            try
            {
                //finding the start of data
                while (true)
                {
                    if (data[offset] == 'd' && data[offset + 1] == 'a' && data[offset + 2] == 't' && data[offset + 3] == 'a')
                        break;
                    offset++;
                }
                return offset + 4 + 4; //move to the offset of the start of the data two fields DATA and DataSize both 4 bytes
            }
            catch
            {
                return 0; // not found
            }
        }
        public bool WaveCutOff(string filePath, int[] channelValues)
        {
            byte[] bytes = File.ReadAllBytes(filePath);
            int startOffset = DataOffset(bytes);
            int dataLength = (bytes.Length - startOffset);
            byte[] data = new byte[dataLength];

            int channel = 0;
            int segmentCount = 0;
            for(int i = 0; i < dataLength; i++)
            {
                if (segmentCount >= 2)
                {
                    channel++;
                    segmentCount = 0;
                }
                if (channel >= channelValues.Length)
                    channel = 0;

               /* if (channel == 0)
                    data[i] = 255;
                else
                    data[i] = 0;*/

                data[i] = (byte)(Math.Abs(bytes[startOffset + i] - channelValues[channel]) % 255);
                segmentCount++;
            }

            FileStream fstream = new FileStream(filePath + ".mod.wav", FileMode.Create);
            BinaryWriter bpisac = new BinaryWriter(fstream);

            //write the header
            for (int i = 0; i < startOffset; i++)
                bpisac.Write(bytes[i]);
            //write the data
            for (int i = 0; i < data.Length; i++)
                bpisac.Write(data[i]);

            fstream.Close();

            return true;
        }