Audio Rate LFO's can go up into the Audio rate like an Oscillator can...But to Get Harmonic sounds, You need Ratios or at least Semitone increments. LFO's generally have only Hz increments. They require lots of adjusting by Ear to hit the right Ratios, that result in Harmonic tones....You would also have to Keytrack the LFO rate so it stays Harmonic across all notes....and they also have limited Waveforms compared to an Oscillator. Oscillators are more flexible too, with stuff like detuning, unison etc....
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