Need advise on PIC controlling a variable resistor

[Ioannis]

More details?

What are you trying to control?

Why is needed more than 256 step?

Remember that Digital Pot's have a minimum resistance at 0 level, usually around 100 ohms or less.

Ioannis

[baldwics]

I am trying to control an audio oscillator from 20Hz to 20KHz. The individual note pitch values are not linear but rather a log function. The manual pot that I am using is 100K Audio Log "LAW" pot that can sweep from 20Hz to 20KHz.

Trying to find a programmable/PIC'able solution to the Log Pot.

Thanks,
Scott

[Ioannis]

You mean that a 100K pot is controling by means of a DC voltage an oscillator? If this is the case, what voltage range is your DC control?

Ioannis