Flashback 2 Expression knob pedal



   I want to get a Flashback 2, but I want to first make sure that I can use an Expression Knob pedal with it to adjust the mix and feedback of the delay.   I was planning on using a SaturnWorks: "Micro Expression knob" pedal.  Will this work with a standard Flashback 2 and does it require A TRS to TRS cable or a TS to TS.  

thanks,  Travis