The sound issue happens when there's no usb HDD attached. By default, when you launch a game it looks for a configuration file with a cf extension (with same name as the rom, for ex: bjourney.cf) in conf directory. It there's no conf file it uses the gngeorc file on usb first, sorry I forgot that...
So, if you use this version only for sd (?!), and want sound you can put .cf file per game on sd card with gngeorc content :
# country?
# japan, usa, europe
country europe
# system type? arcade, home or unibios
system arcade
Yes, it's a shitty solution, the simplest way is to use Blizzo's version if it's only for sd card.
However, I found something very interesting with the cf files. You can add other options like raster for example:
raster true
No more graphical issues on Super Sideckicks 3 and 4 !