In this paper, we discuss in-engine workflows for designing procedural audio for gamified musical experiences in Virtual Reality (VR). Specifically, we present two case studies that explore and compare the use of native and third-party procedural audio solutions in two industry-leading game engines, namely Unity and Unreal. These case studies focus on the design of immersive musical experiences that implement various game mechanics. Modern VR platforms offer users new degrees of freedom for interaction through hand-held controllers, head, body, hand, and gaze tracking, and voice input. Considering the greater degree of agency that these technologies may afford users, we believe that fully procedural audio will become increasingly essential for plausible and engaging experiences in VR. We hope that the case studies presented here will not only document the state of the art in procedural audio but also support the work of other artists and researchers in the implementation of audio for VR games.
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