ZincTrumpet
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abacab
Enjoyed that video! 
Especially that part where Steve described working in phone support at Avid, and then getting hired away by Nine Inch Nails, LOL!!! Decisions, decisions... should I continue working in a cube in an office, or go to work making sounds for a band???
I may grab the demo of Cthulhu and give it a try, at least for experimenting with chording. But since it is a plugin, it is only going to work on one track, so I will still need something else.
Yes, it must have been a hard call
That's true about Cthulu but often you can "steal" parts of the chords for other purposes e.g. the lowest note for bass, or reduced chords shifted an octave up/down for strings/pads etc
abacab
And I really like Tonespace, that will be another great tool for exploring chords and scales.
A lot of the other MIDI tools are standalone programs for a reason. VST plugin design limits a plugin to interacting with one track, rather than the entire arrangement.
For example, that is why Liquid Notes uses a virtual MIDI cable to connect with your DAW. That way it can support a multi-track MIDI arrangement and can keep all the parts aligned harmonically as you adjust the chords in the LN program.
As far as the other tools I am testing go, I really like the UI of Cubase 9 Elements, and the Chord Track with Circle of Fifths built-in is easy and logical to work with. But I am also testing the demos of Waveform and RapidComposer.
I do still need to install Liquid Notes and investigate! I'm not against standalone programs per se it's just how easily their workflow integrates with a DAW e.g. BIAB is standalone but integration with DAW is simple via MIDI/WAV files or even as a plugin. I found AutoTheory too much of a faff to be bothered with it compared to Cthulu.
Still not bitten the bullet with Cubase as I'm also now looking at Waveform! Is it possible to have too many DAWs?
abacab
I think that Waveform actually may have a better creative MIDI tool than Cubase, due to the pattern generator, but the UI is non-standard for Windows and takes a little getting used to.
Same with RapidComposer. It seems capable of some of the same MIDI tricks that Waveform has, but the UI is a little more dated and even weirder than Waveform.
I'll just keep plugging away at these until I figure out what works best foe me! 
Same here!
When I tried RapidComposer a while back I found the UI too complicated and couldn't get on with it.
I have the demo of T7 installed and quite like the everything on one screen approach, but the videos of Waveform that Kenny posted have really got me interested (thanks K). Thanks also Fleer for dropping Reason into the equation - gotta be worth checking out (these forums can get expensive, lol).
I already use EZKeys a lot for it's nice circle of fifths chord input and browser MIDI and usually compare the results with BIAB and go with whichever sounds the more natural or sits nicest in the mix. I am hoping ToonTrack take EZKeys to the next level in future with something along the lines of the Waveform tools.
Have fun exploring all the options, I know I will