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The brain v2 can drive 64 RGB LEDs to put out 7 different colors individually.
Ah i see, 192/3 = 64.
Yes it will be the same brightness no matter how many are on. You can also use 4 of our RGB omni boards to make things nice and easy.http://shop.lividinstruments.com/rgb-omni/
Midi is perfect for sequencing lights. I think you'll find this to be a very good solution.