Seems Cubase has some sort of Chord tool, I don't use cubase so I don't know it's functionality, but we only have a the problematic Chord Analyzer.
 
It would be nice not to forget midi, and progress this side of Sonar. Chord Structures are the foundation of music. With plug ins such as Midi chords, where a single not cane be used to play complex chord voicings, and aid experimenting with fuller sounding performances. Here's a basic image of it set up in Sonar

 

 
You simply press a note, then assign it the chord you want, you can copy that shape, press another note, and it paste the shape and it relates to the new note. Transpose it semitones or octaves (You can't invert or open and close voicing, but other than that it's very intuitive and flexible . Check out this guy, he has 4 running at the same time, and performing just one note at a time, creates stunning pieces. SO one note, 4 instances of the plug, a stack of synths, and a rich ensemble result
 
http://www.youtube.com/watch?v=l5ar_3nGx2w
 
Then there is EXKeys, and it's circle of fifths tool, which allow you to change chords (not on the fly), to different keys, or experiment with adding and droping intervals, invert chords. Still no open a voicing, close a voicing (which seem more important if you are higher and lower on the keyboard). Some of the Chord recognition is dodgy, such as having, labelling a inversion with the new bass note correctly. 
 

 
http://www.youtube.com/watch?v=P_1BgtA_lvo
 
So what am I asking for.
A chord tool, that can:
Trigger users definable chords
Trigger to have a a mono or poly input, so playing a c can trigger a C7+9, or playing a CMaj Triad, could trigger a C7+9, and a CminTriad and Cm7+9
A chord suggestion tool, so clicking would create the the chord, instead of having to enter the notes manually, such as the circle of fifths tool
An inversion tool, that renames the chord to show the new bass note
A Voicing tool, to open and close voicings.
A way that  when the sequence has been made, and is playing, the midi plug in can be manipulated to find new chords and voicings on the fly.
 
I think a comprehensive tool like this doesn't exist, (although I don't know the cubase tool, and if cubase has one, we should) and will allow the Sonar user base to expand its sonic potential, allowing beginners to gain confidence and apply music theory, and advanced player to take things further
.
 
Anyone with experience of other tool, please add ideas
 
 

The chord track in cubase is pretty cool.. ai tend to name clips using the chord sequences they contain so that would br helpful.. interactive clip content would be very interesting...

I wholeheartedly agree with this.  I looked with envious eyes on the chord feature in the latest Cubase. 
 
For someone who barely justifies the term musician, something like this that suggests chord progressions is inspirational gold dust!

I just caught this on my phone and agree wholeheartedly. Another aspect which fits well for a DAW would be the ability to simply select chords (no controller required), and have those notes inserted into a MIDI track. Once inserted, being able to select a chord and adjust its inversion or duration (while adjusting material in the track to open/close gaps) would allow users to create a full song quickly for modification. Almost like a "block module" overlay to the PRV, allowing for adjustment of each block separately, and when completed could be exitted to create the MIDI track for further editing by existing methods.
 
Edit - At its most rudimentary level, a UI where the user could choose key, then drag/drop blocks into a song matrix and choose bar length based on a snap-to-grid concept. Once dropped, lengths, inversions, and chord variations could be chosen by selecting a block (and blocks would immediately shift to either make room or remove gaps). If the UI allowed playing through a VST, this would allow for generic song creation. Once exited, the song would be written as MIDI data to the track. This tool would most likely have to be disabled when exited, as a script to reenter it to modify exiting data would be far more complex. I.e., this would be a tool for song creation only.
 
Edit: I logged into my computer so I could vote for the OP and embellish the description (typing on a phone sucks). This particular feature is one where I wish I had kept up with my programming hobby, as I would take the time to write this one myself.

While it is certainly completely unacceptable to bundle broken utilities with Sonar such as the chord analyzer, and they need to fix it yesterday, if MIDI Chords does the job and works well with Sonar, isn't that good enough? It's a free plugin after all.
 
Within sonar what you can do currently is set up some key binds to the Chord CAL scripts and use them on your single notes in the piano roll. I think it's pretty quick and suitably creative. Don't forget that you can also use Snap to Scale on your midi track.

I think Midi chords can be improved on. For a start I'd like to see it as a midi plug not a vst plug. The creating of cords in combination of the circle of fifths. Manipulation of voicings, so lower voicing could be more open, and getting more and more closed up the keyboard.
 
I use midi chords a lot, but it could be developed. Maybe something more integrated rather than a plug, so you can plan out you chords sequence better, such as the exkeys in the second part of the post.
 
MIDI seems neglected, and it forms for many of us the foundation of our composition tools. The latest teaks to midi are minimal, just miner enhancements to what exists.
 
There seems to be a fuss over how cubase plays with chords and song structure with their latest release. As I posted originally, I haven't used it, but maybe some one who has can enlighten us. A combinations of these feature into one creative tool could make many of us progress our musical ideas and understanding.
 
Snap to scale is something I'd like to get away from, as many chord sequences introduce notes outside of a scale, whilst still being in the original key.
 
 
To VOTE, click on the 5 stars on the first post.

Kamikaze
Snap to scale is something I'd like to get away from, as many chord sequences introduce notes outside of a scale, whilst still being in the original key.

Yeah this is certainly true for the melodic minor scale as well as merged natural/harmonic minor and they should really improve on that and make it more dynamic, allowing composition in hybrid scales more easily. For major scales though unless I'm mistaken I don't think you can have chord notes outside of the scale.

Nah, notes outside the scale is common in mucis in a major key, not just melodic notes either. Take C Major with the common chords C7, F7, G7. Well the dominant 7th of C is Bb, so there's one, yet the Major third of G is is B. The the Dominant 7th of F is Eb, yet the Major third E, so there are 2 notes there in a simple 3 chord progression. As soon as you add any harmonic complexity you'll have more notes outside of the Major Scale with 9th, 11ths etc. This is the cool thing about EZKeys, is that it shows the related chords, but lets you experiment intuitively with more harmonic colours. Breaking free from a Modal approach to building chords, that fit to scale creates.
 
This is why I believe Cake should develop the composition tools, they are currently lacking

It would indeed be nice if we could get some chord tools for composition, always good for inspiration.

chtuhlu does this

https://www.xferrecords.com/products/cthulhu