Low-Z to Hi-Z Guitar Input

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Hi all,

After digging through Google there are plenty of simple opamp schematics for running a guitar into line level - but I want to do the opposite.

I'm eyeing up a cheap audio interface which has guitar (Hi-Z) inputs. The problem is that I'm wanting to run line level (eg from a mixer) into it (at normal operating levels). I figure it's as simple as a resistor or two but I'm not sure what values I'd want to be using! The interface specs say the input is 500k, 4.5dBV max.

I realise I could use a couple of transformers out of DI boxes but just whatever has the least colouration of sound would be ideal!

Anyone able to shed some light on this for me? Thanks!
 
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