Quoted from Reefkeep:2) the SPEAKER lights do not change colors in the test and they are making a humming sound.
Any thoughts on speaker issues?
On the lighting, are your speaker lights blue? If so, it is working correctly. Good news, you can make the speaker lights interactive by relocating a few pins. I did so in just a few minutes and am very happy with the result. A reminder for others that this requires the PCB that comes with the RGB GI and topper upgrades.
Just follow the instructions (thanks @kapsreiter!), which were reposted in post #761. https://pinside.com/pinball/forum/topic/sneak-peek-mmr-xl-display-amp-rgb-controlled-gi-s/page/16#post-5803389.