Be aware that using the pHAT DAC and Unicorn pHAT together is possible, but not straightforward. Because they both using pin 18, you’ll need to change the Unicorn pHAT to use pin 12, rather than 18. The Mini Black HAT Hack3r is the best way to do this and you’ll need to solder a wire between pin 18 on the Unicorn pHAT and pin 12 on the Mini Black HAT Hack3r. Then, you’ll need to reassign the data pin in the Unicorn HAT library to be pin 12.
I had problems with stuttering with the pHAT DAC and Retropie. I’m sure it solvable, but I’m exactly sure how, currently…