We recently got asked on twitter if you can connect the piSound to the pi-top . The short answer is yes!
Just like any other HAT, you’d have to connect the piSound to the pi-top  using the male-to-male header extender that comes in the spare parts baggy inside the pi-top  packaging. Next you’d have to go into /boot/config.txt and disable the GPIO configuration.
Word of warning, you’ll be disabling the OLED Screen here but it is reversible
Go into /boot/config.txt and comment out dtoverlay=spi-1cs
Restart the pi-top and then run the pisound installation.
I don’t have a pisound HAT so for all of you that do, please let us know your results!