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            // create device
            
            Microsoft.DirectX.DirectSound.Device m_device = new Microsoft.DirectX.DirectSound.Device();
            m_device.SetCooperativeLevel(this, DXS.CooperativeLevel.Priority);
            
            // create sample
            
            int SampleRate = 32;
            short BlockAlign = 32;
            int duration = 100;
            int frequency = 1500;
            
            int length = (int)(SampleRate * BlockAlign * duration);
        byte[] buffer = new byte[length];

        double A = frequency * 2 * Math.PI / (double)SampleRate;
        for (int i = 0; i < length; i++)
        {
             buffer[i] = (byte)(Math.Sin(i*A));
        }
        
        byte[] sample = buffer;

            // setup format

            DXS.WaveFormat format = new DXS.WaveFormat();
            format.BitsPerSample = 32000;
            format.Channels = 1;
            format.BlockAlign = 32;
            format.FormatTag = DXS.WaveFormatTag.Pcm;
            format.SamplesPerSecond = 32;
            format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlign;

            DXS.BufferDescription desc = new DXS.BufferDescription(format);
            desc.DeferLocation = true;
            desc.BufferBytes = sample.Length; 
            
            // secondary buffer
            
            DXS.SecondaryBuffer CurrentBuffer = new DXS.SecondaryBuffer(desc, m_device); // error
      CurrentBuffer.Write(0, sample, DXS.LockFlag.EntireBuffer);
      CurrentBuffer.Play(0, DXS.BufferPlayFlags.Default);