This tutorial was tested on two computers using Ubuntu 14.04. I tried it on both kernel 3.13 with trusty graphics stack and kernel 4.4 with xenial graphics stack. ssf2t.zip and sfiii3.zip were the roms tested.
1st - Launch terminal and run this command:
nano -B .config/retroarch/retroarch .cfg
note: This command will open the nano editor making a copy ( -B ) of you config file.
2nd - Find the setting audio_out_rate ( ctrl + w) and change it’s value to anything greater than 48019.
audio_out_rate = 48020
The audio should be OK after this change.
Please feel free to give any suggestion especially why this happens and what is the best audio_out_rate value.
Thanks.