Finally more time to finish this one... I even thought about adding something new to emulate for a while, but too many things to do for that for now, maybe later... So the main fixes are around the game controllers, and the dead zone of some which canceled the moves from the d-pad. Also there are about 100+ new recognized game controllers for linux, and 400+ for windows ! (more people would use windows ? What a surprise !). All these new controllers mappings come from there : http://raine.1emula
Very old stuff : I found lately a forgotten file in the git repository, galaxian.c in the sound directory which was a beginning of the emulation of the sound for galaxian, which I had started around 2007, and then completely forgotten, it was imported in the initial commit to git in 2009 and I didn't even notice !
At that time I had given up the idea because the sound for galaxian is quite crazy, there is no sound command, no dedicated cpu for the sound, and the main cpu directly plays with