I have a pretty new computer with Logitech speakers and some time ago I suddenly received this crackle sound when I was almost finished with my melody. It's similar to what you could hear from old gramophone records. The first time I could solve the problem by deleting a track. I got the impression that it depended on the vst-instrument, checking the tracks by muting them one by one. This time it doesn't work. My computer is an Alienware with Realtek HD Audio sound. It has worked fine to 99.99 % otherwise. I also wonder if it could have to do somehow with the number of tracks in Magix Samplitude Studio 20013. So far I have never used more than 8 tracks. And it doesn't happen all the time. Very strange, I think.
Very greatful for any help
Gunbjo