HF to LF shelving filter

[emosms]

Hi
I found this extremely simplified schematic of a variable frequency HF shelving filter:

An externally hosted image should be here but it was not working when we last tested it.

Responds pretty well, at least at the simulation.
Is it possible to turn it to a LF shelving filter?
To cut/boost BELLOW the border frequency?
Best Regards

 

[DF96]

Swap over C1 and (R5+RV2). Then check for stability.

 

[emosms]

Thx!
Just skimming through the book and couldn't even recognize
the simpliest topology of low/high pass filters
Works!