To convert a linear pot to logrithmic, add a fixed resistor between 1/4
and the value of the pot from wiper to common. For a purely linear pot
the lower value will make it a reasonable approximation of a log pot.
This should work fine in the original Onmi VI. I'd suggest maybe
something like 1/2 or 3/4 the pot value. I don't know what the pot's
value is so can't suggest in more detail.
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