Originally Posted by
mostapha
I would focus on the fact that slightly different equipment in venues leads to an inconsistent performance environment: different levels of Pioneer CDJs have different feature sets that change the way the DJ can perform. Yes, it's possible to play on all of them, but it's not always possible to give your best performance and manipulate the crowd the way you're used to: not having access to a much-needed feature like hot cues or beat-loops (which Pioneer makes you choose between) means that your normal techniques to rotate groups between the dance floor and the bar may not be as effective on one system as another. By using a controller and having a well-managed backup system in place, you ensure that you'll be able to appropriately manage the crowd and maximize profits for both the venue and the promoter while providing an emergency plan in case some integral part of the venue's DJ booth fails. While you understand the visceral appeal of traditional techniques and the completely rational fear of relying on cutting-edge technology, the benefits of encouraging diverse performance media vastly outweigh the downsides of new methods of performance.
After a speech like that, you have to deliver. Failure is not an option…but it's a very effective way to call someone an idiot without them noticing. It addresses all of the concerns I see in his statement, it focuses on his needs, brings up a potential disaster that he probably hasn't considered–that only affects his method, it keeps the argument "about equipment"–which he seems to like discussing, and it leaves you the option to back down and say "you're the client…CDs are fine…I'll just bring it as a backup," if you chicken out or can't pull it off.
Obviously…the effectiveness of this technique is inversely proportional to both the intelligence and manipulativeness of the promoter.