Latest MPCNC Firmware with a new laser, help with connection

I don’t understand the question. If by “goose controls” you mean “g-code commands,” then the answer is probably no. Older documentation uses M106/M107 fan commands to control the laser. Pin 45 is controlled by inline commands but M03/M05 will also work. The first post at the top of this forum topic has a g-code file attached that has in-line commands.

If you follow my advice and get LightBurn to control your laser, you will want to setup your laser as inline:

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If you have a voltmeter, you can (carefully) test pin 45 before your laser arrives. If you have the LCD for your Rambo board, you can use the LCD to turn the pin on. The wording is funny. I think you have to turn the laser off in the menu in order to have manual control of the power. I’m not near my machine to check the exact method. Or you can send g-code commands. “M03 S255” turns the laser on full power, so you should see 5V on your meter. “M03 S128” is half power and the meter will read around 2.5V. “M05” turns the laser off.