So I came across this with the new emulator as I have been out of the scene for a long time and I'm not sure if its been mentioned before. Most Scorpion 2 machines have the volume set to 0 or very low.
I thought I would post this here in case anyone else has the same issue.
Scorpion 2 Machines No/Low Sound
1) Clear any credits
2) Tick S Door (Some Machines Require S Door - Luvvly Jubbly)
3) Click Test (It looks greyed out but it still works)
4) Click Flashing Start Button until 'Set Volume' is on Dot Matrix Display
5) Press Exchange
6) Press Hold 2/Hi to increase volume to desired level (Max 31)
7) Press Start
8) Untick S Door (Machine will now reset)