I found one mistake, on the simulation, on a resistor value on the resonance path. Not sure if this was spotted before.
The 1M to ground is set to 1m, so 0.001R I guess. (thanks (@analogoutput )
Seems to be working here (more or less) : https://tinyurl.com/2dxljq2d
I changed few values here and there. (to me) It looks like the numerous capacitors are making the simulation tricky.
Or 0.001R.
Case matters!
| Factor | Name | Symbol | Factor | Name | Symbol | ||
|---|---|---|---|---|---|---|---|
| 10^24 | yotta | Y | 10^-1 | deci | d | ||
| 10^21 | zetta | Z | 10^-2 | centi | c | ||
| 10^18 | exa | E | 10^-3 | milli | m | ||
| 10^15 | peta | P | 10^-6 | micro | µ | ||
| 10^12 | tera | T | 10^-9 | nano | n | ||
| 10^9 | giga | G | 10^-12 | pico | p | ||
| 10^6 | mega | M | 10^-15 | femto | f | ||
| 10^3 | kilo | k | 10^-18 | atto | a | ||
| 10^2 | hecto | h | 10^-21 | zepto | z | ||
| 10^1 | deka | da | 10^-24 | yocto | y |
Hahaha, I hesitated to put 0.001mohm. Does such low resistor value actually exist ?
Maybe a thick wire that you cool down? 
Getting close to superconductor realm
Becareful - that could be considered a typo of mho - or ohm spelled backwards to designate conductance in siemens: Siemens (unit) - Wikipedia
I played around with the circuit a bit and got the impression that the range of the CUT OFF pot was too large (in extreme setting the filter dampened the input signal completely but also output a slowly decaying DC voltage). For this I changed the resistor values for CUT OFF a bit. I left the rest of the circuit untouched (see pic below). Note: setting T1 and T2 is crucial. When using the modified circuit and setting T2 in the mid position and T1 at about 90% reducing the range of the voltage CUT OFF can be set to in the simulation gives a nice range of low attenuation to full attenuation of the signal (as a LF filter). The resonance pot also has a nice effect.
