How do I setup Potplayer for 5.1 via SPDIF passthrough (optical)?

[mossifirestick]

I have a Soundblaster Audigy with SPDIF optical out which I have connected to my Yamaha RX-V377 5.1 receiver.

How do I setup Potplayer in order to play the 5.1 sound via SPDIF passthrough and the optical cable connection?

I'm a bit confused by all the available settings so any assistance would be greatly appreciated!

Many thanks!

[Gus.Ghanem]

Preferences > Audio > Audio Output > Passthrough Renderer

Set Built-in Audio Decoder button

I've always used analog stereo, so I have no experience with this. I'm still confused after decades of using PotPlayer.

[mossifirestick]

I connected via HDMI just to test it and I get the exact same.. I tried to configure via Windows directly to produce 5.1 sound, not messing with Potplayer or anything. So this is HDMI from PC to AVR, HDMI from AVR via ARC to TV. I used HDMI 4, I select HDMI 4 and then I go to Windows - Sounds and I try to configure the speakers to 5.1 and it keeps playing all other channels through the 2 front speakers.. all speakers have been tested and working fine on their own so it's not the speakers..