Feature request GLX: Harmonizer - Smart Harmony

I like the pitch shift included but what I miss is a harmonizer or (as line6 calls) smart harmony.
In this effect you define the scale, root and interval; then the effect makes the harmony.
Tonelib GFX already has a nice pitch shifter, making a harmonizer should'n be so complicated, yo need to know the note which is played (the tuner already does that) then with a table now which is the note that needs to be "made" and with the pitch shifter make it.