Hey fellas - I'm still reasonably new to this Randall thing, but I now have more modules than spaces in my RM100 to put them. These are mostly for studio use and I don't mind swapping them out all the time, but would prefer just to rack 'em and leave 'em. Is there a way to get the RM4 and somehow use it in conjunction w/my RM100 or is it best to just keep getting more RM100's?