Use override to modify laser power

I'm installing a 20w laser on my CNC and I control the power of laser using the spindle pwm. The software LightBurn use M67 to control the laser power. I modify the HAL file to connect  analog-out-00 to the spindle PWM and set the scale. The laser is ok and the power change. Can i use the slide of spindle override to increse and reduce  the new laser signal ????  I'm not expert to configure linuxcnc. 

Did you want the laser PWM controlled by both the feed rate and motion.analog-out-00?

If so you probably want to add a scale component to multiply the analog out setting by the feed rate.

thank you very much. I really wanted to multiply the two signals but I didn't know the commands. now I understand and I will try.

The problem is solved. I add HALUI in my INI file and use a scale function. Now I can modify the laser power using the slide during the work. Thanks.