I have essentially no idea of what I'm doing, but with a little fumbling I made a first-order 2-way crossover with a 2.82V p-p sine wave input and variable frequency.

When you get it "right" you get an oscilloscope window, and you can move a voltage probe around the circuit to see amplitudes. Varying the frequency you can see the effect of larger caps or smaller inductors etc...

You can learn a lot with this thing.

• CircuitMaker