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In the last years the emotional impact of artifacts became more and more interesting to the field of human-computer interaction research. Despite many models that describe factors of user experience (UX), most of them are of a descriptive nature. In contrast, we propose a theoretical approach, the model of user experience (MUX) that offers an explanation for the emergence of UX starting from the very first interaction steps. Additionally, we present empirical results that support these assumptions of our theoretical approach that were under investigation. In detail we found that affordances as well as standard signals foster users performance on a small time scale (up to 3 sec.). However, these small changes affected peoples UX. Hence we conclude that it is a fruitful approach to start investigating UX on a keystroke level.