If you want to enter the world of pure tuning and the universal frequency model Natural Tuning, I recommend the digital instrument Pianoteq. It is perfect to learn how the correlations are and how it sounds.
Here you can see 12 scales of the Natural Tuning system with their frequencies and you can also download the temperaments, which necessary for The Pianoteq instrument.
It’s all very simple.
If you want to hear the 12 scales working: