This is the one I did, works great.You should be able to order one made from here, but some parts and assembly required:
https://oshpark.com/shared_projects/q6nKRQBW
Yeah, I know what you mean about the MV-1C. I installed a tianfeng Omega MVS AV board in my CMVS, which has a low pass audio filter, and that improved it somewhat.Thankyou, I will check it out. A long time ago I did this mod on a MV1C but I get a lot of background hum.
http://www.jamma-nation-x.com/jammax/cmvs.html
Nothing for the MV1B from me at the moment. I'll have one for the MV1FZ for sale soon.I remember the user Everten made some stereo pcbs for one of the neogeo mvs board models. I am not sure he has them in stock, but I would ask him. I have used his Taito f3, STV, and sony ZN1 (the board that has rival schools) and they worked great![]()