@bpappas welcome 
to the community!
Are you using a preamp or amplifier into the power station?
I just got this to work using a preamp and external FX with the PS-2’s FX send and return.
I put Power Station into Self-Attenuation mode.
The FX is injected into the signal after the Amp-In (or Line-In), the effected signal enters the Power Amp and can be accessed via the Speaker Out. In Self-Attenuation mode, you take the Speaker Out and connect it to the Amp-In. Now Line-out can be connected to you DAW and you should hear the FX.
Add an IR or it will sound like ass.