ARTE Riff Mountain Dev Diary 3 : the characters
Welcome to ARTE Riff Mountain: in this third Dev Diary, the episode shines a light on a key pillar of the experience… its characters, and the voices that bring them…

The entire SoWhen? team is proud to share its gold partner status, officially accredited by Unreal Engine Epic Games via Accredible.
SoWhen?, a CreaTech company founded in 2010, supports major corporations across various industries in the strategic creation and management of their Digital Heritage. Since 2014, it has been leveraging Unreal Engine to develop innovative interactive content and experiences that help clients achieve their objectives.
SoWhen? operates its own R&D lab and a hybrid studio called “Multivert,” which is directly connected to Unreal Engine, UEFN, and its proprietary technological bricks. This space is dedicated to the production of cutting-edge content (virtual production, markerless motion capture, etc.), serving as both a playground for R&D and an experimental hub for clients during workshops.
SoWhen? has internalized all the expertise required to support its clients in innovating their communication strategies. We provide end-to-end services, from creative concepts to the deployment of physical or virtual experiences, whether for long-term strategies or one-off events.
SoWhen? utilizes market-leading technologies while also developing its own proprietary solutions to optimize production (saving time and money) and drive innovation by integrating them with Unreal Engine.
Here are some examples of projects delivered for our clients:



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Welcome to ARTE Riff Mountain: in this third Dev Diary, the episode shines a light on a key pillar of the experience… its characters, and the voices that bring them…
SoWhen? has been an Unreal Engine partner for the 4th consecutive year and renews its recognition as a top-tier partner worldwide!
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Hellfest announced the release date of ARTE Riff Mountain, coming on November 21st, 2025, and revealed its official cinematic trailer.
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