Fat Bustard and recaling mixes

Hi Catherine,
I read in your interviews that you use the Fat Bustard as a summing mixer. I wonder if you have any issues with recalling mixes through it? I have one and found it really difficult to match settings, I like the idea that things are unpredictable but in practice it gets tricky when clients ask for the exact same mix but with minor changes! I’ve tried cloning the sound character of it using various plugins but I’m not there yet. There’s something really magical about the box!