The sounds are a little harsher in fbneo (more high-frequency?)
The sound in FBNeo should be accurate (one of our devs has access to the cabinet). Make sure you are using the right sample file for each emulator, iirc MAME need sample files with the matching samplerates, while that shouldn't be a major problem (apart maybe quality loss) for FBNeo which will convert at runtime if it doesn't match the expected samplerate. You might also want to play around with sound settings in FBNeo's core options if you don't like the default (requires restart). Btw, i'm using that sample with dkong on FBNeo (it's not copyrighted content afaik so it should be ok to share).
Video smoothing often makes the picture way too mushy for my taste, especially if the original resolution is very low. I prefer good crt shaders like the zfast shaders from @ghogan42.
As for other video settings, I prefer the "core provided" aspect ratio, because I don't like, say, a 4:3 picture stretched to today's common 16:9, or the 3:4 ratio of many classic vertical games stretched to the native 4:3 on my DIY cabinet, making all game characters appear a little overweight to outright obese.
@melbmatt50 i did - both links are instructions for “headless” (no screen) set ups. you just need to plug your sd card into the pc you used to the write the image and create files in the /boot/ partition.
If you use a Euro (PAL) rom on a US (NTSC) machine, the game will run fast.
If you use a US (NTSC) rom on a Euro (PAL) machine, it will run slow.
So, if you are in the US running RetroPie on a US TV, you should not use a European rom. You can switch the Pi into PAL mode (if you have a TV that can tolerate it) and it will run at normal speed, but I wouldn't recommend it if you can just get the US version instead.
Looks like a permissions problem or a funky named controller that's not saved or possibly other problems (disk full ?) that prevent Emulationstation to save the controller configuration.
My advice is to start with a clean image and work from there - https://retropie.org.uk/docs/First-Installation/.
there is an option to select analog or digital in mame2003+ as it supports analog 2003 doesnt just go to your options and change you controller setting to digital.
it sin options->control mapping change it to digital and it will work for snes pads and arcade sticks ect with having to set all the inputs. The majority of people want real analog controls when available so thats the default.