Very well.
Grauw is my circuit design OPL2. Alexey helped me to communicate with you.
OPM Light from me. I/O Ports $38, $37. BUS -> MSX-EXT.
I have tested VGMPLAY 1.3-RC5 and it is working very good with Neotron. Thanks, Grauw for your hard work making our MSX sound amazing with every release.
Could be, it wouldn’t be the first time it’s a hardware problem 
. Thanks for trying it!
Do you think you could look into what happens on the Carnivore2? VGMPlay does a simple “magic string” check to see if the MMM is detected in what’s really the C2 slot, it works in the emulator but not on the real device… Somehow the slot mapping or memory contents is different from what’s emulated?
IIRC what we discussed about that on Nijmegen, it is because magic string is not found because C2 is boot with a slot configuration which is not the same as when you boot with F5 key pressed (as required for FW updates, where the code also look for this magic string). Which actually makes that detection code quite useless in real life. And since magic string is not detected, and the memory mapper works the same as one in MMM, it makes a false positive for it
I will ask Alexey for help with solving this issue btw, i guess I'm almost obliged to take it because i have C2 and i know a little bit the vgmplay's code
