How to "speaker fill" or " Stereo upmix" (same sound to all 5.1 speakers) Xonar U5?

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I Have Xonar U5 connected to my computer via USB and there are 2x2.1 and a separate center speaker all connected to Xonar U5 with 3.5mm.

It all works fine except for one very annoying fact that I can't seem to mirror the sound from the front speakers to the rear speakers (which I want for music etc).

The built in program "Sonic studio" doesn't have any options for it and the most popular answer (which doesn't work involves going into said speakers properties and check "stereo fill" under enchantment tab, but I don't have that tab (Screens below) To be blunt I want the same audio trough all channels but cannot achieve it

Xonar U5 properties (in volume control)

All audio related stuff on my computer

/Omen

Omenchild

Posted 2016-04-10T18:31:26.677

Reputation: 1

So you want stereo using 4 speakers? – Xavierjazz – 2016-04-10T19:20:06.973

Yes I want stereo sound on 5 speakers. – Omenchild – 2016-04-10T19:31:46.427

What is happening now? Really, you should edit the question to be more specific. It could be closed as too broad. :) – Xavierjazz – 2016-04-10T19:41:53.220

I think I was pretty specific but nwm I edited it alittle. – Omenchild – 2016-04-10T21:22:18.743

Sorry forgot to mention that I would not like to Y split the audio – Omenchild – 2016-04-11T10:02:34.850

No answers