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In the DX7, you could have an operator feedback into itself, as all the operators were sine waves, this feedback (an operator modulating itself) was a way to get a different waveforms. You can see the feedback enabled operators of the DX7's algorithms here:
FM is definitely a bit of black magic, especially if you've been spoiled by the simplicity of subtractive synthesis!
Edit: Didn't realise the feedback could cover multiple operators (as seen in algorithms 4 & 6). I'm glad I've never had the misfortune of trying to program a DX7. On a related note, Dexed is a great freeware VST that's excellent for playing around with FM on. Accepts DX7 sysex patch banks too
mmccarthy
I loved my Re-DX too, and squeezed some great sounds out of it, only ever by accident though...
Never understood why they called the waveform modifier "feedback."