Ah okay. I tried nether earth and venom both don't work.
Didn't try others.....
All the other tips didn't work for the above games (neither Gluk nor Real Commander or starting with run instead of load).Also ALT+F5, or even saving config, reloading core and so on ... nothing worked.
So maybe only a handful of GS games work. Checking others tomorrow.
But it doesn't matter that much for me!
I never had a spectrum and never had GS Sound. I was just curious and wanted to try it for fun. Also I wanted to learn about that system and I got a handful of tipps from you both. Thank you Sorgelig and albconde.
Two beer or not two beer? - Shakesbeer.