With the latest official and unofficial bootstrap, the sound in SM64DS, MKDS and NSMB is crackling even when set to "Stereo".
Also Soul Silver is working great with official, has AP issues with unofficial.
I took a look at the rail and noticed that the two last pins were soldered for some reason, luckly I still had the rail of my broken joycon so after I swapped them I was able to use it attached to the console