The Octo and high Flow Next have a Signal header that can be configured to output a temporary LOW (like a dry contact) across the pins. Cable #53216 plugs into the Signal header. The other end has a split cable - one side plugs into the Mobo power switch header. The wires from the case power switch plug into the other side. This puts the cable from the Signal header in parallel with the contacts from the power switch. I attached a picture with labels that show how this cable gets installed. When the Alarm is activated, the Octo or High Flow Next outputs a 1-second LOW on the pins which emulates pushing the power switch. I don't think the Quadro has a Signal header so it does not support this feature. To use it in this way, go to the High Flow Next Alarm tab and click the button for "Power Switch, switch 1 seconds at alarm". Connect Cable #53216 as shown in the picture. BE CAREFUL when you set up the Alarm. When I first did it, I made the mistake of testing it with a condition that occurred during startup. The result was every time I booted the computer, the Octo would immediately shut it down. I had to disconnect the cable so I could boot, then get into Aquasuite to change the Alarm trigger.
High Flow Next LEDs - Details about the High Flow Next LEDs, the RGBpx port, and how to control them is detailed in the Owners Manual, Section 10 which you can download
HERE. You control these in Aquasuite, in the High Flow Next RGBpx tab. It's done the same way as any other RGBpx port in Aquasuite. The RGBpx port on the High Flow Next, D5 Next, Quadro, and Octo have some limitations compared to the RGBpx ports on a Farbwerk360, and they are not all the same. The High Flow Next has 10 LEDs built in. The RGBpx port can drive up to 90 LEDs. Since the only power to the High Flow Next is from its USB connection, if you want to drive a lot of LEDs (up to 90 on the RGBpx port) you should plug the High Flow Next USB cable into a USB port that can provide 2 amps of current. In Aquasuite, go to the High Flow Next System tab and enable "Allow USB power supply with up to 2 A.". The Farbwerk360 has Molex power and does not power the RGBpx ports from USB power.
The High Flow Next RGBpx is limited to 8 LED controllers - 2 for the 10 integral LEDs and 6 for the RGBpx port. In comparison, the Farbwerk360 RGBpx has up to 20 LED Controllers and up to 60 Assignments using Multi-Assign. It also has Transparency which is a very powerful feature that allows different effects to be stacked. The effect at the top of the stack takes precedence but by setting a Transparency level, effects lower in the stack can bleed through the effects higher in the stack. I think only the Farbwek360 and Farbwerk Nano have Transparency. The RGBpx ports on the other products have limitations but are fine for doing basic single lighting effects.