Duplicating someone's CDG or DVD discs are a direct violation of FEDERAL LAW and you will lose all your studio gear if you are caught doing this.
If your customers want to get different compilations of songs from discs they already have, and they will not use the new discs while the originals are also in use, then it is a backup. If they use both at the same time, they are violating FEDERAL LAW and can lose all their equipment. Be very careful... simply because someone asks you do to this, if it is illegal, don't do it. Life is too short for the few bucks you will be paid.
Now, as to "editing" CDG discs, there really is no way to edit these in any significant way. If you want to take entire songs off and recompile them in a different order or with different songs, this is possible with our Microstudio software. If you want to change the lyrics in a CDG song, you can use Microstudio to import the music, and KPro to add the lyrics to it from the start. However, if you are using a copyrighted CDG disc for the music, be careful not to violate copyright law again. As a professional studio, you should be aware of the limitations of using others works to create new works that you do not pay royalties on.
