Question about Cthulu chord generator

I'm currently using my computer keyboard to trigger notes in piano rolls ect.  I was trying the Cthulu demo and it seems the only way to trigger the chords is by using my keyboard to input notes but since i don't have the full range of keys of an actual piano, when using that I miss out on a lot of chords (about half).  Is there any other way to trigger the chords in Cthulu?  Maybe i am missing something in the options like a setting to allow me to use the on screen keyboard at the bottom for this purpose.

I would suggest to use your DAW piano roll, this way you are composing at the same time you are experimenting.  You can shift-alt-click on the piano to have chords get triggered.

Thanks that works perfectly.  I just wanted to make sure I could get full functionality before I made the purchase.  Love your products!