I am a newbie and trying to understand the operation of this White Noise Coloration Filter - I have contacted the original author but at time of writing have bot received a response.
The circuit is as follows (I have retained nomenclature from original post for clarity)
I can't figure out how the bottom half of this is a high pass filter (unless the resistor to ground is R5 and RV1). I can sort of see how the top half is a low pass filter but cant understand how/why the potentiometer and the first 4k7 resistors function.
The OP says
R4/C4/R5 and R6/C5 form low- and high-pass passive filters respectively. The pot pans between them by proportionally grounding one, or the other, or somewhere in between
I've tried to look at this by splitting it into two halves but not sure if that is valid and have made limited progress in my comprehension.
Any pointers on how to go about decomposing this to understand how it works would be gratefully appreciated