ABLETON USERS: using ADAT with Ext. Audio Effect

Hey folks,

I recently got an old Alesis AI3 that I am using with my PreSonus Quantum 2626 interface. I am able to record signal going into the ADAT but cannot figure out how to make an effects loops with it.

Here is my setup:

Guitar > channel 2 (inst) on PreSonus

Ableton Return Track (G) has an instance of Ext. Audio Effect

Ableton guitar track send pot (G) is at unity gain

I am using a delay pedal that has been tested and is fully working

Pedal output >> input 4 of the Alesis

Alesis output 4 >> input of the pedal

Yet nothing is driving the pedal even though I have the Ableton guitar track armed and the send pot at unity.

As a test: I unplugged the ts cables from the pedal and heard treated/delayed crackle (so the inputs and outputs of the Alesis are indeed working).

Thanks!

LL