Hi. Thanks for the answers.
At the moment I use Ableton and some Max-Plugins to create random melodies that I then feed into my Models:Samples or Cycles, but I would like something that doesn't require my PC. I've looked for standalone random melody boxes, that could simply send a midi-signal into my Model:Samples or Cycles, but such a thing does'nt exist.
I specifically look for something that can create random melodies on the fly by simply turning a few knobs or pushing a few sliders around, without having to program every note into the stepsequencer beforehand. That's why I like the idea of the Varigate 4+.
The Manther Growl is just the synth I chose for now, because it sounds nice, but I might add other synth-modules later on.
So my initial question still stands, if this setup would allow me to do what I intend.