Hi, @kblaschke
I, for one, would love to have this visualisation implemented into Strawberry. That's what would give it that additional oomph. Clementine indeed had an inferior version of ProjectM. so I'm delighted to see that development is continuing.
I sadly am not (yet) capable of undergoing a complex task such as adding ProjectM to Strawberry, but here's to hoping that there is a willing, competent enthusiast out there. If anyone has experience with visualisation tools or software development, your contribution could make a significant difference.
Here is the most obvious resource for anyone interested:
https://github.com/projectM-visualizer/projectm/wiki