Amazonia.de review the Radius 4 in a wonderful fashion...

Sonically, the Radius 4 is consistently convincing, be it from the basic sound, the HPF or the Master EQ / Isolator. The technical data are outstanding, sometimes even better than the PLAYdifferently Model 1.

https://www.amazona.de/test-master-sounds-radius-4-rotary-mixer/