public RESULT createDSP(ref DSP_DESCRIPTION description, out DSP dsp)
 {
     dsp = null;
     IntPtr raw;
     RESULT result = System.FMOD5_System_CreateDSP(this.rawPtr, ref description, out raw);
     dsp = new DSP(raw);
     return result;
 }

 private static extern RESULT FMOD_System_CreateDSP(IntPtr system, ref DSP_DESCRIPTION description, ref IntPtr dsp);

        public RESULT createDSP(ref DSP_DESCRIPTION description, ref DSP dsp)
        {
            RESULT result = RESULT.OK;
            IntPtr dspraw = new IntPtr();
            DSP    dspnew = null;

            try
            {
                result = FMOD_System_CreateDSP(systemraw, ref description, ref dspraw);
            }
            catch
            {
                result = RESULT.ERR_INVALID_PARAM;
            }
            if (result != RESULT.OK)
            {
                return result;
            }

            if (dsp == null)
            {
                dspnew = new DSP();
                dspnew.setRaw(dspraw);
                dsp = dspnew;
            }
            else
            {
                dsp.setRaw(dspraw);
            }

            return result;
        }

 //private static extern RESULT FMOD_System_RegisterCodec          (IntPtr system, out CODEC_DESCRIPTION description, out uint handle, uint priority);
 //[DllImport(VERSION.dll)]
 private static extern RESULT FMOD_System_RegisterDSP            (IntPtr system, ref DSP_DESCRIPTION description, out uint handle);

        public RESULT createDSP              (ref DSP_DESCRIPTION description, out DSP dsp)
        {
            dsp = null;

            IntPtr dspraw;
            RESULT result = FMOD_System_CreateDSP(rawPtr, ref description, out dspraw);
            dsp = new DSP(dspraw);

            return result;
        }

 /*
 public RESULT registerCodec(ref CODEC_DESCRIPTION description, out uint handle, uint priority)
 {
     return FMOD_System_RegisterCodec(rawPtr, ref description, out handle, priority);
 }
 */
 public RESULT registerDSP(ref DSP_DESCRIPTION description, out uint handle)
 {
     return FMOD_System_RegisterDSP(rawPtr, ref description, out handle);
 }

        private void CreateInputReadDsp()
        {
            this.callback = this.ReadCallback;

            var dspdesc = new DSP_DESCRIPTION();

            dspdesc.numinputbuffers = 1;
            dspdesc.numoutputbuffers = 1;
            dspdesc.read = this.callback;

            this.fmodSystem.createDSP(ref dspdesc, out this.recordDsp);
        }