Why are tracks added to the download queue, when I try to play tracks in iTunes?
HookUp is either in Play Mode or Download mode. In play mode you can double click files in iTunes to play them. However when the download button is pressed and while there are still files being sent to the download queue then you can not play tracks and if you double click a file in iTunes it is added to the download queue rather than played. Once all files have been added to the queue, you are back in Play Mode and you can stream tracks and download as long as your bandwidth can handle both.