Earlier in the year I reviewed an app called "Tap DJ," a set of virtual turntables for mixing songs on an iPhone. I had some good things to say about it, but on the downside, I thought the controls were too difficult to manage on a small touchscreen. Really good DJs aren't just standing there slapping turntables and flipping switches at random; it takes a lot of finesse to produce sound that doesn't cause physical nausea. I thought that finesse just wasn't possible on an iPhone screen, especially when it comes to one fundamental skill in particular.
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