Hello
I have just brought a thunderbirds pachislo machine (it is my first one). I can’t find a manual pacifically for the thunderbirds machine also there is a loud humming coming from the speakers and I don’t know how to stop it.
Also the machine only has three volume settings and even on the quietest one it is still really loud, how do I fit a volume control to reduce the volume?

Can anybody help me please?
Thanks Beakyx7