John Ogle 05fed3ede1 Add virtual 4.1 surround sound configuration for zix790prors ...

Create a PipeWire virtual surround sink that routes audio to multiple
physical outputs:
- FL/FR channels → AmazonBasics USB speaker
- RL/RR channels → Fosi BT20A PRO Bluetooth speaker
- LFE channel → AmazonBasics (duplicated to both channels)

Uses loopback modules with systemd services to maintain correct routing,
as PipeWire's target.object parameter doesn't auto-connect properly.
A timer checks every 10 seconds and fixes incorrect connections.

Configuration is machine-specific and isolated in virtual-surround.nix.

2025-12-29 12:01:29 -08:00

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