Would the crackling sound have anything to do with the refresh rate of my TV ? I’m on 50Hz most of the time (i’ve set it to 60Hz for US Console roms). Maybe the reason I don’t get crackling sound on AdvanceMAME because there’s no VSync (I get a lot of screen tearing). Just out of interest, is your TV running Mame4All at 50Hz or 60Hz ? Or doesn’t it matter ?
I might try a RetroPie 2.6 setup tomorrow just out of curiosity. Thanks for replying.