Hello HT,
The first question to consider is whether the
original audio was recorded in 5.1 format. Some video cameras have microphones capable of recording in this format, picking up sounds from different angles. In studio recordings, the different channels are used to mix dialogue, music & sound effects (recorded separately).
I only mentioned the above because what's called 5.1 surround sound can play back very differently. The most basic difference is discrete (different sounds in each channel) & matrixed (audio in one channel is reflected in others). You'll see & hear this when you are using different 5.1 audio in
ADR.
What audio are you mixing? It
sounds like you're using stereo source material & mixing it across the 6 channels. If that's the case, I'd just set the pan at centre so the same audio is fed to each speaker/channel. In a studio mix, you'd typically find dialogue balanced toward the front and sound effects to the rear.
I can now see why my initial suggestion cannot work for you in this case, because the audio is not yet mixed as you wish.
PIX
PIX YouTube channel