I'm on a Mac with an Xbox 360 controller too. I had issues, but after installing the latest driver from the link above it finally started working. I also have to go through a process everytime I launch Volo:
- Have the controller unplugged from the computer
- Launch Volo, get to the 'select location' screen
- Plug in the controller and hit a few buttons until you see the 'Xbox controller recognized' alert
- Go to settings -> input and reset to Xbox 360 default controls
Not sure why it doesn't recognize the controller when it's already plugged in, but this works fine for me.