Not so much a problem, more of a gotcha. I had difficulties when using the Surface Pen or using my fingers on a Surface Go.
Realtek High Definition Audio(SST)
Equalify Pro version
220.127.116.1164 (master 9640f15)
I investigated DPI-related issues, scaling, hardware acceleration, but ultimately the solution was to attach the Surface keyboard/mouse and was then able to use Equalify normally. This may not affect many users, but could be something to keep an eye on.
Thanks for the fantastic software, and keep up the great work!