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Can't figure out why this circuit won't simulate:

https://www.circuitlab.com/circuit/8jsr9n/experimental-tone-stack/

Any ideas?

Your circuit looks just fine, I agree this should simulate. I got the circuit to work by placing a 1 Ohm resistor from the tap of R10 to Ground. This suggests a problem with the potentiometer component in CircuitLab - if doesn't seem to like having the resistors directly shorted out. Odd.

That fixed it! Thanks! I guess there must be a bug in the solver.

Hi all, this was a small bug in how K=0 and K=1 ("turning the knob all the way left or right") were handled in the potentiometer element. I've now deployed new code that should fix things. The original circuit (without the 1-ohm resistor R11) should simulate just fine now.

Thanks for reporting & investigating!