Is short: they ask you to invest 4 hours of your time and it is likely that you will get only boilerplate replies from them. First of all Native Instruments sends you the task to complete. They ways that you should not spend more then 4 hours. After that the keep quite for 2 weeks until you do a couple of follow ups and then they send standard rejections email. You have no way to explain the reasoning behind you design and thinking. My takeaway: never waste your time on tasks before you spoke with a person who will evaluate your works and you know that he/she is reasonable human being.