Debates like this perfectly depict why MIDI is not widely accepted quite yet. Frankly, why would this be an issue?, it's the DJ's job to be flexible and apply their skill set across varying settings regardless of medium. If you are allowed to use your controller, cool, and if not - roll with it and rock the venue, it's the name of the game.
In similar circumstances I've come across, I personally could care less. I also got a booklet of CD's which are current, organized, and ready to use without the aid of my laptop or controller. At the end of the day, it's maintaining creativity while keeping it within a business mind set
Although no offense meant at all to anyone on the forums (I really mean that), but I find the people who more often than not have a problem with them not being able to use their controller at a venue typically rely all too much on the program to do their job for them. It's a great medium, I myself love it, but it shouldn't be pivotal/critical/necessary in being able to get the job done, unless theres some crazy Rafik/Hawtin/Dubfire shit going on in your set which demands it (to be honest, that's practically nobody I've come across in most of these cases, they're usually the ol' cue/pause/play style users).
But again, I think at the very least a club owner should justify their position on their suggestion to a DJ with regards to why their medium causes conflicts to the clubs platform. As charo mentioned, stability I believe is a bigger issue for most.
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