frequency control of higher order filter with mono pot

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Hi,

I would need a (low phase shift) 12 dB high-pass filter, where I can change the cut-off frequency just with a mono pot.
Is this possible, since a 12 dB filter is a 2-pole (when using caps and resistors) and the cut-off frequency of each pole has to be changed simultaneously and so I would need a stereo pot.

Any experiences?
 
its got one knob...
 

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Thanks for your posts.

The mechanical solution would be probably too "expansive" 😉

VCA solution should work. Is this standard solution filter freq by a pot? I can't remember haven't seen VCAs in synthesizer filters ...
 
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