I just posted a page that describes a GPIO-based CW keyer for Quisk. This has been tested in the following configuration: Raspberry Pi 4, HobbyPCB RS-HFIQ, Quisk 4.1.52, and a breadboard GPIO input circuit for plugging in my paddles. Feel free to check it out, ask questions, comment… I’m sure there are some errors.

Again, here’s the page: Quisk Mods for Pi-HFIQ