i've used it on magix music maker before, . i had to open it up as a plug in from the effects rack section to get it to work right. if i opened it up seperately it did what youre mentioning , just sortof muted the sound,, but when it actually worked i found it to be pretty useful for a few different things , its pretty cool on guitar parts, as far as correcting vocals, as long as they were close to the right pitch it would fix it up nicely on the automatic mode, i never effed with the graphical mode, but i hear it is much better if you can use it properly. but, anyways, try opening it from your effects rack as a direct x plug in , if you're already doing that, then i'm sorry for rambling on for nothing,. lol. i'm sure someone can help you more