First of all, I'm really grateful for all the feedback, positive and negative, about my project. When I started this 6 years ago, I was teaching myself harmony. Writing a Ruby Gem was a way of making sense of all that and at the same time making what I consider "music calculations".
A lot has happened since then. I've realized that while a Ruby gem might be cool for some applications, I really wanted to have something more visual and more inviting. Like an app. I have completed my (belayed) college degree on Graphic Design with my final project being this app's design. It's all ready. Now it's just a matter of finally implementing it. So I've been working, since around 3 years, on a multiplatform app. Possibly also a VST plugin version for DAWs.
Thank you all for the interest on the Gem/CLI project however. It's not abandoned. Since many of you expressed interest on it, I'll take a look at the problems you reported. Certainly a way to install via homebrew would help I believe.
It's 4 AM over here now so I better cut it here but will comeback later and maybe answer some of the individual messages.