The Power Station is a great standalone tube power amplifier that can warm up amp modellers, however, sometimes people are confused about why the line-out does not work when they plug their modeller into the line-in. Watch Joe and Steve answer this question here,
To summarise, look at the Power Station’s signal path: Line-in is not connected to Line-out. The Line-in routes directly into the power amp and the power amp connects to the speaker out, as you would expect.
The line-out originates directly from the reactive load and provides a line-level representation of the high-power signal entering the Amp In jack.
If you need a line-out signal, take it from your modeller rather than the Power Station.