This is usually a codec issue. It will not only happen in Blitz. Try playing a midi file in Winamp (whoever has the crackly problem) then start clicking in IE and EXPLORER. Even those simple "click" sounds will send the midi output all crazy. On some people's comps, it'll happen in movies, or anything. To get around it in Blitz its a matter of closing the app and restarting (as Blitz doesn't do a clean restart of DirectSound just by stopping all playing channels - not Blitz's fault - most programs don't). In Winamp, simply stopping the file from playing does a clean restart (whereas PAUSEing it doesn't).
Recommendation: Try a clean install. If this is unfeasible, finding and uninstalling all the un-official sound codecs you have. (You might need a third party utility to help you do this - so hit google), then reinstalling official sound codecs. Packs like Nemo Codec Pack spell trouble. Sure a lot of people will swear by it, but if you're like me you've installed HUNDREDS of different versions of codecs on ur computer over the month and need to do a clean slate every now and then.
Of course this isn't the only thing that can cause the problem - bad drivers, old drivers, two incompatiable drivers for the same card, some other program running trying to take over the stream - all sorts, but codecs problems are the most common.
Recommendation: Try a clean install. If this is unfeasible, finding and uninstalling all the un-official sound codecs you have. (You might need a third party utility to help you do this - so hit google), then reinstalling official sound codecs. Packs like Nemo Codec Pack spell trouble. Sure a lot of people will swear by it, but if you're like me you've installed HUNDREDS of different versions of codecs on ur computer over the month and need to do a clean slate every now and then.
Of course this isn't the only thing that can cause the problem - bad drivers, old drivers, two incompatiable drivers for the same card, some other program running trying to take over the stream - all sorts, but codecs problems are the most common.