This article takes an in depth look at mapping. It suggests appropriate mapping strategies for various control situations based on practical experiments. In particular it suggests that a divergent (one-to-many) or not one-to-many mapping strategies are more suited to complex control situations (but lead to difficulties for simple situations) and in terms of music offer an increased potential for ease of expressivity. Not only this but it suggests that systems "which utilize a measure of the user's energy under the control of more than one limb (or body part)" are "more engaging to users" (with respect to simplistic one-to-one systems, such as the one screen slider controller used in the study).
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