Hey Mesh,
I purchased this Monday this week. I have been using it in Sonar X3e 64 Pro with no problems at all. It is kinda intimidating at first but after I figured the routing out it is as easy as below:
Instantiate the Cthulhu vsti like any instrument so that you have a midi and audio track for it (the audio track comes in handy for using the on-board tone generator while getting things setup, you can toggle the speaker on Cthulhu's ui on or off to hear the tone generator)
Instantiate another vsti that you would like for it to send the chords to.
Route your midi controller(keyboard) to the input of Cthulhu's midi track input
Route Cthulhu's midi track output to the midi track input of the above vsti you want to send chords to.
Call up a chord preset and play any single note on your keyboard and it will trigger the chord ,associated with the preset key, on the other vsti.
While the presets are interesting the real power comes in being able to learn and save your own... It will learn new notes by playing them on your keyboard, while in Learn Mode, but it does not pickup velocity and you will need to manually adjust with the mouse or type in the value for each note. Still, VERY COOL TOOL for $39.
Up to 8 notes, each, at separate velocities can be triggered by one key on your keyboard. Great for playing chords you could not play with one hand while freeing up the other hand, or for background horn or string sections.
I've only scratched the surface so far but If you have any other questions I can try to answer them for you.
Kind regards,
Rick