@LuigiPulcini Have you been in contact with any Envato staff about this great and well presented idea? If not, some Envato staff should be tagged here at the very least to make sure they don´t miss out on this idea.
Also if you as programmer have any opinion about how automatic volume leveling for preview could be implemented, please feel free to chime in on the discussion here: [IDEA] LUFS Normalization for All Audiojungle Tracks a.k.a. How To Stop Destroying Your Music?
Thanks!