Yes, it's a bit of a work-around, but the Yamaha THR does have an effect loop function. It's great for using a loop pedal live. Here it is:
First, open the app, go to settings, and make sure "Guitar Audio" is set to zero. Then, simply connect the output of the pedal to the auxiliary in put of the THR (1/4 inch to 1/8 inch cable required), and connect the line out of the THR to the input of the loop pedal. Set the playback volume of the loop pedal to match your input volume, and use the THR "Audio" knob to set your overall volume.

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