> I'm not opposed to using an opamp as a buffer, I think I'd prefer to
> find a single supply one though as I don't think there are negative
> voltages in there already

You could make a little -ve with an opamp or somesuch as an oscillator

> Any suggestions? I've used the TL072 before but I seem to recall
> someone mentioning it isn't the greatest nowadays

I think the TL062 is the quiet one

The NE5534 has been popular for quite a while

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