I'm a drummer, not professionally, just like to play with my family.
I dig Slow Down Music trainer-- unfortunately right now it's only an iphone app. I emailed the guy at his website and asked him if he plans on an android version. He says he's working on it, and wants to make sure the quality is perfect before he released it. I hope it's soon, it's hard to learn Metallica drum solos at full speed.
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