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Hello again! I'm working on an arcade machine i have here at home. using Arpicade, The monitor as opposed to cga/tube is now VGA. as the arcade didn't come with a CRT Tube monitor.
I'm using the Mame 251 as it runs the game perfectly, and uses the trackball controller perfectly (It's a racing game that uses an opto board as opposed to a pot, so it acts like a trackball as the opto IO board is a track ball variant)

Now. everything is perfect. but when i run the game. the game will run horizontally perfectly. but squished to high heavens vertically. in the video mode of Mame 251, if i set the 'non-interger scaling' to Y only, or 'On' it fixes this issue. but then if i exit. or restart the Raspberry pi. it'll reset what i set the video mode to. and cause it to revert back to the squished picture. as 'Non Interger Scaling' reverts back to 'X Only'

Any clue on how i could fix this? I feel dumb for asking. but i've been searching through the SD card partitions trying to figure it out and i'm just incredibly dumb it feels like ahaha

Hello ^^ i've seemed to have gotten it all to work after much tinkering around. Everything works perfect now except that the Audio i can't seem to figure out how to force out through the headphone jack of the Raspberry pi 4, adding amixer cset numid=3 1 to the run.sh's did not seem to fix it.

Edit: Ended up fixing this too by changing the config.txt file aroudn a bit in the boot parition. However if you intend to do stuff like this you should use a separate powered amplifier between the sound and the speakers because hte sound is rather low otherwise. using USB speakers plugged into the RP4 causes a grounding loop and insane EMI/noise to rip out.

Glad you figured it all out.  Sorry I wasn't around to help.

Was that using ARpiCADE_4 or _5 ?

Glad you figured it all out.  Sorry I wasn't around to help.

Was that using ARpiCADE_4 or _5 ?

No worries,  i saw you had some life things going on so i understand :3

It was the Arpicade 5 image. For some reason or another when i use Arpicade 4 with my Raspberry pi 4, it says the image is out of date, and i need to update something? I couldn't figure it out. luckily Arpicade 5 just immediately loaded up no problemo.

The controls of the arcade machine are using a Trackball Opto board. to wire the steering wheel using the original Opto board, i used a Ultimarc I-pac, and wired it to move on Y axis for the trackball section as opposed to the spinner section. So for future reference if people here intend to use Arpicade with real hardware, Assuming your arcade machine uses a Opto IO board for your steering wheel. or a trackball ect ect. I-pac will support it out of the box with Arpicade. 

Something i should note about using USB powered speakers. On my Raspberry pi 3. i'm using old compuet speakers that plug into the USB port. the same ones i tested on the RPi4 with the EMI noise. using a Raspberry pi 3. the speakers exhibit 0 noise. Possibly something to do with the power of the raspberry pi? or perhaps the way the Pi 4 is versus the Pi 3? Couldn't say. butr basically the take away from this is. don't go out of your way to buy a different amplifier or something to power the sound if you already own speakers that plug into the 3.5mm jack on the RPI4. it might work with no noise.