To enable 5.1/7.1 for stereo sounds on none Microsoft sound driver you need to:
1. Open regedit and navigate to this key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render\
2.Get ownership of that key (right click permissionsadvancedowner select your user and click OK)
3. Open notepad and paste this (MS effects extracted from previous sound driver)
///// STARTS FROM NEXT LINE //////
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render\{zzz-zzz-zzz-zzz-zzz}\FxProperties]
"{b725f130-47ef-101a-a5f1-02608c9eebac},10"="Microsoft Audio Home Theater Effects"
"{d04e05a6-594b-4fb6-a80d-01af5eed7d1d},1"="{62dc1a93-ae24-464c-a43e-452f824c4250}"
"{d04e05a6-594b-4fb6-a80d-01af5eed7d1d},2"="{637c490d-eee3-4c0a-973f-371958802da2}"
"{d04e05a6-594b-4fb6-a80d-01af5eed7d1d},3"="{5860E1C5-F95C-4a7a-8EC8-8AEF24F379A1}"
"{d04e05a6-594b-4fb6-a80d-01af5eed7d1d},0"="{00000000-0000-0000-0000-000000000000}"
"{5b64fcb1-8c32-4844-9dcb-15a45df000fc},3"=hex:0b,00,75,00,00,00,00,00,00,00,\ 00,00
//// ENDS ON ABOVE LINE /////
4. Replace {zzz-zzz-zzz-zzz-zzz} with name of sub key that in Properties have text “Speakers” (There is other key for SPDIF but we need Speakers). Key name looks like this {957cbc9b-91c5-4753-8dd0-80ca0555ae09}5. Save As sound.reg6. Double click to load it in registry7.
Open speaker properties and under enhancements mark SPIEKER FILL option
Now you have 5.1/7.1 on stereo sound and better revert registry key ownership to SYSTEM
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