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Now to my question: 'Can I patch this modular grid sketch up. or Will feeding back Audio Rate Modulation to the same Oscillator from where It came hurt something?
-- zuggamasta

Nah. Might be a tad difficult to control, but you won't blow up anything with that trick. Fact is, lots of synthesists use feedback paths to beef up a sound. Probably the best-known example of this is (ab)using the Minimoog's headphone out and external audio in to set up feedback to add some "oomph". As long as you're not patching outputs to other outputs, you're golden.