By now it is common knowledge that the Zemmix Neo is a great MSX machine, very compatible and feature complete, but it has a very noisy audio output. I have one of the Brazilian Zemmix Neos and this kinds of ruin the experience for me, so I got very excited when I heard KdL added support for balanced audio output to the OCM firmware.
I got myself a proper cable a couple months ago, but real life prevented me from testing it until yesterday. My Zemmix Neo had an old firmware, so I proceeded to install the most recent one (3.5). I was a bit afraid of bricking it, but the process couldn't go more smoothly.
As soon as I sent the proper smart command, I was surprised to see most of the noise was gone. But, and this is a big but, there was still noise. It got much better, but it was still bad, so I was kind of disappointed, despite my initial surprise. I tried a few VGM files, but then I decided to try the Xak 3 set.
Then I noticed the FM/PSG balance was borked. I'm not 100% sure about this (should have made some recordings for comparison purposes), but I really don't remember the PSG being so much louder than the FM. I reduced the PSG to level 3/7 and it still seemed a bit too loud, but 2/7 made it almost inaudible, so I stayed with 3/7. As soon as I can I'll test it further, and throw the SCC in the mix to see how it goes.
I wonder if anyone had the same issues, and whether it is something related to the new firmware or the balanced audio.
