Over here, I found this code:
t = Time.now.to_i
use_random_seed t
Doing that in conjunction with rrand_i does give different sequences, so it’s not deterministic—but the ratios are just as bad, like 60-67%. As pointed out, pseudo-randomness and repeatability have a musical value, but I’m concerned about melodies always ending up in the stratosphere, and things like that.