In fact, FusionDsp is a plugin for Volumio 3. It is based on CamillaDsp (all effects are handle by).
It provides a lot of features, and no need to tweak some files…
Just enable ‘plugin test mode’ in IP/Dev and install it from the plugin store.
Please report your experiences in the related thread : FusionDsp for Volumio3 beta
Last thing, what is the tutorial your are talking about? I still haven’t wrote it! 
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