protected unsafe void EnableActionSetPresetIndex()
        {
            iCallbackSetPresetIndex = new CallbackSetPresetIndex(DoSetPresetIndex);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceLinnCoUkDelay1EnableActionSetPresetIndex(iHandle, iCallbackSetPresetIndex, ptr);
        }
 static extern void DvServiceLinnCoUkDelay1EnableActionSetPresetIndex(uint aHandle, CallbackSetPresetIndex aCallback, IntPtr aPtr);