Dubstep Demo Opinion

Hi I’m just wandering what do you think about this dubstep demo I made.br
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I’m really wanting any advice to make it sound a bit more professional (what I could change what need to be lower in terms of mixing etc) br
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Thank You Very Much!br
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=D br
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Here it is;br
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iframe width=“560” height=“315” src=“//www.youtube.com/embed/wWZv5IU5rAY” frameborder=“0” allowfullscreen/iframe