External iPhone FX & OP-1

I’m looking to introduce some external FX into my OP-1 set up and I’m feeling that a couple of iPhone FX apps will fit the bill. (AUFX Space for delay and Squashit for distortion).
Would I be right in thinking one of the iRig interfaces would work as a conduit between the OP-1 and iPhone? Or will I need some other form of audio interface?

I use a Line 6 Sonic Port because it has a 3.5mm stereo minijack in and out. I plug my ATH-M50s into the 1/4" (6.3mm) stereo output.

You’ll get feedback unless you do @docshermsticks trick with splitting and whatnot, though.

Yeah, I saw that the other day. Duly noted!