Don't use the trimming tool with the GBAMP version, as the link I posted states. Obviously if you're running a GB game you aren't going to notice any difference. Try running a GBC game to see that you can actually play them now.
If you're looking for colorizations like the GBC automatically added to old GB games, it's not possible. The coloring info is not stored in the GB rom. Each GB game has a colorization entry stored in the GBC BIOS itself, which nobody has been able to dump.
It's not possible to multitask, so you cannot play music from your card at the same time.
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