Just now experimenting with programming Servos in xLights.
I created models (16 servo PCA9685 board, connected to a Pi with an OLED screen output to I2C )
What I see on screen is just a Red rectangle. I put servo values on it (16bit) but I see no motion on the preview screen.
I'll get the board and a servo or two connected later this week and see if it makes an attached servo move.
I was just expecting to see some sort of preview indication or movement. By double-clicking on the model, I can see the values depicted as it goes from dark to light ( 0 to 100 ).
If there is a video on Servo usage, I haven't found it yet.