Hey, one of the first modules I ever wanted was a Livewire Vulcan Modulator http://www.analoguehaven.com/livewire/vulcanmodulator/
Simply put, this is a dual LFO where each oscillator has FM on its output. (There are additional outputs for sum/difference/min/max.) It’s not hard to patch two LFO’s together, although many LFO’s out there don’t have FM CV attenuators.
I’m just wondering if there is anything like this pre-built out there?