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Emulation retroArch Audio

Links

Windowws Audio Drivers
Direct X 9 etc
Dx9 again

Summary

On a different machine I got no audio and video ran fast. Turns out this is an audio driver issue.
Retro bat lists as a pre-requisite dx9. I recommend just installing this and leaving defaults.
on new windows, wasapi should work fine.
on old windows, with dx9 installed, xaudio should work fine.
I tried wasapi and it works without dx9 however it requires us to change from auto and use non defaults in retrobat which I am not a fan of.
I think the missing audio drives also caused strange issues with the speed of the games. they ran fast.