Which pins are used by the Respeaker 2-mic raspberry pi hat?

I want to use a breakout board on my Pi 3B+ but then the respeaker hat can no longer be fitted. I’d like to run wires from the breakout board to the hat. I’m sure that not all of the pins are used.

Hi, wyovino:
I can provide an idea to let you know which GPIO ports are used:
You can install the GPIO library interface wiringPi on your Raspberry PI. After installing the respeaker on your Raspberry PI, you can use the gpio readall command to see which GPIO ports are used