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From an 2011 interview, when asked what equipment he uses to produce: "I’m using Logic 9 on my Mac Pro and Apogee Duet soundcard."
In a 2013 video, at the 3:58 mark, Hardwell is asked by a fan what sound card he would recommend for a starting producer. Hardwell responds by saying "A sound card I can recommend is this one, the Apogee Duet, I've used this one for almost 5 years, and it's definitely one of my favorite sound cards."
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