Joining DVD's

hi
I hve just finished downloading 2 torrents of a concert. The concert has been split o fit onto 2 Dvd5 disks. I have played them and are of good quality and would like to put onto a Dual layer disk. I have tried to use several apps and when finishedthe sound quality is up the s**t and loud squills. I tried DVD Remake Pro and also i had a go with DVD shrink but wanted to keep menus and also it had loud squills as well.Is there anyway i can get around this or is there any othe app i could use. I have WinXp.

Thanks
:doh:

I don’t see how DVD Remake Pro could be responsible for the poor quality sound.