beeps when dropping key in microstudio demo

[degsinger2007]

Hi! I am testing microstudio (newest version).. Everything is impressive but when i drop the key for songs (both cdg and harddrive) i getting these intermitent beeps and the lyrics and audio cut out and back in. I don't have these problems when i play songs without changing key.
I am running it on windows xp home.
I wanted to know if this is just an annoyance in the demo? I want to be sure before i purchase this that it won't be an issue. I have this issue with a different program that I use know. Any help would be appreciated.