Decode Pro Logic to Discrete Channels

Manually copied from googlecode issue tracker before moving it (reported after the auto-merge)

Reported by xnamkcor, Yesterday (17 hours ago)
What steps will reproduce the problem?

1. Dolby Pro Logic must be output via Stereo analog from computer to PL capable receiver.

What is the expected output? What do you see instead?
BizHawk could decode the Pro Logic signal(or capture a usable signal in emulation before it gets encoded to Pro Logic) and output it to the system as discrete channels of audio?

What version of the product are you using? On what operating system?
None

Please provide any additional information below.
Supposed examples of Pro Logic used for actual "surround"(extra channels of audio being decoded) and not just "fake" sound tricks. Something that can be(?) emulated as a more modern sound delivery option(discrete channels via HDMI/Coaxial) to a receiver.

Yesterday (17 hours ago) Delete comment #1 xnamkcor
Forgot to actually add the link to the examples. http://www.gamnesia.com/articles/throwback-thursday-top-5-uses-of-surround-sound-on-snes

The issue names no files, tests, or entry points to inspect. First clarify whether the goal is Pro Logic decoding, preserving an emulated signal for external decoding, or discrete-channel output, then define the supported output path and a reproducible validation case as the completion criteria.