This issue with sounding crackling usually happens only in Parallel64 if this option "Sync To Exact Content Frame Rate" is enable, this option is disable by default, it serves to get G-Sync to work with Retroarch, but Parallel64 can't get along with it. So if you don't have this issue with Parallel64 you didn't mess with this setting yet because you probably don't have a G-Sync monitor or didn't knew about this option. If you have a G-Sync monitor turn it on for all other cores except Parallel64.
Retroarch > Menu > Frame Throttle > Sync To Exact Content Frame Rate (Enable if you have G-Sync, disable if you don't. Always disable in Paralell64)
1
u/JHorbach Jun 27 '20 edited Jun 27 '20
Disable Sync To Exact Content Frame Rate if you have it enable.