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Wilkie1 – you are correct with regard to audio quality being higher with faster slew-rates in opamps. But in the Rat (and a few other circuits) the slower slew-rate is low enough to have bearing on the upper registers of the audio range, providing a unique sort of distortion. From what I could make of my studies when I had a real scope, sweep generator and such (a few decades ago), the type of distortion harmonics seemed neither odd nor even – more like “diffused” or just degraded. Glad to hear you found some value in the info.