Today I’ve finished and tested front panel PCB.
You may find one noticable feature on this board: I’ve used MEC 3FTL buttons instead of widely available and cheap B3F-like tact switches. Theese switches are designed to embed 3mm LEDs and have longer travel distance.
Panel has total of 13 inputs distributed between 2 IDC sockets. It’s connected to control board with two ribbon cables. Backlit is powered by 12V PWM controlled signal and is connected to control board with separate 2-wire cable.