today I received a 2nd GS-only SC-55 for my builds. Naturally I tested it and found that the 2nd unit is a GM-compliant one, with Breath Noise and all

On the following pics:
the upper unit is the "real?" GS-only unit with a serial of AC93519
the lower unit is the the one I just got, with a serial of DD61319
Here is a pic of Duke Nukem 3D level 1-06:

and here is tilakat's Descent2 mid (d2b.mid , stock game midi AFAIK)

and here is the same midi patched to play the Fl. Key Click instrument on GM units - the upper unit plays nothing on channel11:

I have tested Capital Tone Fallback feature in both units with unpatced/unmodded World of Xeen installation, arrow sounds play fine after you shoot - start walking - shoot again when you first load a game.
In DN3D and in tilakat's Descent 2 midis, the lower unit behaves like a GM-compliant one as you can see from the pics.
Anyone here has more info on this? Maybe some other test , something to show the version of the units? Or maybe this is just a GS-GM mobo in a GS-only case... (although it really seemed unopened, the roland tier ups etc, where unharmed)

As always, any extra info/thoughts would be appreciated
