If you have the ability to use vcv and your modular together then I'd explore the random sources in there to start with - as they are free... they may help you decide... there's no menu diving on Marbles... just a few modes & especially with vcv where you can choose them from a menu, it's very easy to get on with!!!

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities