Hey @JoeyButters, pretty ambitious stuff for someone who describes themselves as a newbie!
I don’t know if what you’re wanting is possible at present. Without seeing your current development patch (upload it - it might get someone thinking…), my best guess at achieving what I think you want is rather clunky and would involve a some controller telling Midihub how many notes are in the next chord before you play it. Not very ‘natural’!
PS. thx for the like on Fluid Tempo Changes; I’ll post up my first ‘proof of concept’ soon (for what it’s worth!)