Note: trigger output 2 is defaulted to OFF for all inputs; trigger out 1 defaults to ON. If you are not using output 1, ensure you have trigger 2 set to ON for each input.

Not to derail the thread too much, but is it a mono cable? It needs to be. If it is, leave one end connected to the Model 976 and have the other end open-ended; use a multi-meter to ensure you have 5VDC at the other end of the cable. If not, you can always remove the cable, from the pre-amp, and check for continuity between the two ends of the trigger cable. If you have your 5V in the first place, time to contact the amp manufacturer.

The DLI IoT should also work, but check with the amp manufacturer. Customer's reported the trigger input, on the IoT Amazon page, working with 3.3V. The 976's trigger therefore should energize the relay in the IoT and take your normally open outlets and close them. Essentially, the amp has to have an always ON option, rather than just a standby state, and when the pre-amp triggers the IoT, it will then send the ~120VAC to the outlet the amplifier is plugged into.

Please feel free to email me at customerservice@outlawaudio.com .