CD-G discs have to be read using certain drives, that are old enough to be 12x or slower (Not all drives slower than 12x, just most). I believe there was some sort of legal issue, so the 12x drives were, for the most part, the last drives that could read and write CD-G discs. Many new drives list CD-G as a format they can use, the catch is that they can only write it, not read it. I'm actually using an old HP 9300 CD-Writer, for other people who want this capability I get on eBay to find these drives, I normally can get them for under $30 USD (Requires patience sometimes).
I've had some minor issues with CloneCD and copying CD-G discs sometimes, so sometimes things must be copied more than once. I use version 3.0.9.1 of CloneCD for copying copy protected CD-G discs.
Since I have only come across 2 discs out of 300 that were using a copy protection scheme requireing that version of Clone, I use Dart Karaokee Studio CDG for everything else. With Dart you can rip just certain tracks, and compile your own custom CD-G disc.
Also make sure the discs are as clean as possible before copying it. I have no ideal why, but if you copy it with finger prints and such on it, the lyrics on screen can come out sort of blurry or distorted in places, cleaning the disc and re-copying it always clears this up (Haven't truthfully figured this out, since the originals play fine?).
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