Quoted from rick6668:

OK, so I'll start by saying, if you are going to try and modify the microSD card you do so at your own peril. This process can be very glitchy are a number of times I've re-inserted the card and the sounds didn't work, the config file wouldn't read etc. I was really scared at one point when I had to re-format my original card and re-put the files on it. That card seems to work in almost all cases but won't play the goal horn for any of the later teams properly. I have a card I purchased and loaded that is working fine, and I'm leaving that untouched so I can always restore it back to the original settings. Anyway, proceed at your own risk.
If you are going to mess with your card, I recommend purchasing another card to mess with.
I bought 2 of these https://www.walmart.com/ip/Sandisk-Ultra-Plus-32GB-MicroSD-Card-SDSQUB3-032G-AWCMA/845798122
Before pulling the card or putting you hand inside your machine, make sure it is unplugged every time.
Once you pull the microSD, make a backup of all the files on your PC. I created a folder called SuperChexx and a subfolder Original. When you remove the SD card from the PC slot or USB adapter, make sure to safely eject it to prevent issues. (There is an option to do that in windows before physically removing it)
I would then insert your new card, format it, then place all the files on it. Once done, insert it into your machine, plug it in and test it out to be sure everything is working correctly. Make sure the Anthem lists and Team lists scroll properly. (I have had issues where it wasn't being read properly in the past few days).
Once this is done you might feel comfortable making some modifications.
Just a note, it seems to me the data from the microSD is loaded into memory on the main machine. At one point I uploaded a wav file in place of an anthem, and it was longer than the original file which produced some strange results and even after removing the file from the card, portions of that sound file would play after other clips.
At first, I tried taking a WAV file and replacing an existing file with it. I started with a Mike Lange "He Shoots and Scores" file in WAV format. I replaced files 030-034 all with this file. Since this was 5 files out of the 10, I figured it would play for about half the goals. This did work, except the sound was all distorted, so I needed to investigate further. I downloaded Audacity (per my son's recommendation) and examined the 030.WAV file. I noticed all the original files are at a Project Rate of 22050 HZ while the file I used was 44100 HZ. I modified my file and retested and it worked correctly. So all files must be saved at this frequency. I had some issues with volume on my files, but my son showed me how to manipulate the setting in audacity along with how to pull audio from a youtube clip.
So now that this was working, I tried making some changes to the goal calls and this was not as easy as it seemed. Something caused the clips to sometimes cut off and other times to play one clip part way then another clip. I checked the file length on the files I replace and then adjusted the file length on the new file to exactly the same length but it still is not quite right, so I have more work to do.
For those that only care about the Boo files, the best Boo file that is on the card is 051.WAV
The files that play when the Boo button is pressed are 050.WAV-068.WAV. I would think you could replace all those files with the file 051.WAV and just name them appropriately, but looking at the original files, they have different lengths, so I'm not sure what will happen. I may give that a shot next.
Also, I modified the Config file and change the first NOT USED anthem to PITTSBURGH, then I modified the file for 153.WAV to be the Penguins Theme, "Boys of Winter". I set the anthem to PITTSBURGH and this worked, although the file I used was 2 minutes in length and the US anthem I replaced was 1:13. My new file would play for 1:13, the the US anthem would play for a little bit, then the puck drop, not sure why that occurred and the Russian anthem is almost 3 minutes, but it must be coded that way, not sure. I've since removed those changes to try and restore things to normal.
I was able to successfully change the OT home call to "Elvis has just left the Building", so that is pretty cool.

Quoted from Flipper_Ripper:

Yes I put in an order before the new year hoping I would get it before Christmas but no luck and I just got word it’s finally ready.

Thanks. Anything technical I need to know? How do I change settings or just basics? I seriously know nothing about this machine. Is it simple to just plug and play?

Quoted from Trooper11040:

they told me I had to send the board in to be flashed and would be $100 plus shipping