Good morning.

This might relate to another sub section of this forum, but this is my first post, so please forgive me if my first post is misplaced.

I am trying to set up a generic 5.1 downmix inside Totalmix FX, for Headphones and Stereo confidence monitoring
The web is full of different views on how to set up a generic 5.1 downmix .....

Quote from Wikipedia on Surround Downmix settings

Left total/Right total (Lt/Rt)

Lt/Rt is a downmix suitable for decoding with a Dolby Pro Logic upmixer to obtain 5.1 channels again. Lt/Rt is also suitable for stereophonic sound playback on a hi-fi or on headphones as it is.

Lt = L + -3dB*C + -3dB*(-Ls -Rs)

Rt = R + -3dB*C + -3dB*(Ls + Rs)

(where Ls and Rs are phase shifted 90°)

Does RME agree that this is the proper math to do a generic 5.1 downmix ?
If so ...  how do you achieve a  90° phase shift in Totalmix FX ?
Does anyone have a better idea ?

Regards Nils