Automation HAT PWM

Thanks in advance for your help. I saw this post regarding PWM w/ the Automation HAT: 0-10 VDC control voltage. Possible with automation HAT?

However, I wasn’t able to make it work with my MD13S. My motor controller is connected to the 1st digital channel and I’ve implemented the code from that other post. I have a feeling there’s some other bit that I’ve missed…