Blade, I know most of what is in Oatmeal including all the oscillator mojo that is under the hood
When I find something I like I tend to dive in deep and get close and personal with it. I used to have a DX7 (sold it a few years ago) and I think I'm one of the very few people that was actually a certified FM sound engineer (did a FM programming course at the Rotterdam Conservatory back in the days).
It's a pitty I can't find a good freeware 6 osc FM-synth that I like so far but I can always fall back on FM7 if needed
Oh, and before you point me to them: I really like the big FM synths by Odo but they have 'issues'