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@Gordon
Nice! Honestly, I have no idea - I've always steered away from analog electronics!
But it seems odd to me - the first Op-Amp should be trying to drive its output as hard as possible, so it'll be 'fighting' the capacitors and inductor and the sound you get will depend pretty heavily on how much current the Op-Amp can produce. I'd have thought R6 should ideally go between the first op-amp and the capacitors/inductors - rather than after.