If the ASIO driver is loaded in AVS Recorder and you see all output channels ...
Now send audio to an output channel of your choice. It doesn't really matter which one.
You can use e.g. Analog 1/2 or whatever outputs.
Then you should see audio in TM FX (middle row) under Software Playback AN 1/2.
Now create your submix for e.g. HW output AN 1/2 by selecting this channel in the bottom row
and raise the fader of Sw Playback AN 1/2 towards 0 dB.
And if you need a submix for your phones ? Same procedure, you only need to select a different HW output and then create the submix for this channel.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13