AudioProcessorGraph with multiple output buses

Based on a Cascading plug-in effects tutorial, I have BusesProperties for AudioProcessor with 1 stereo input but 2 stereo outputs, and I’m traying to get this scheme to work:

mainProcessor -> osc1Node -> fx1Node -> out1
mainProcessor -> osc2Node -> fx2Node -> out2

but I can’t figure it out how to direct the signal from osc2/fx2 nodes to output 2 (second stereo bus). I guess that this is called auxiliary buses.
Is there any example how to set Buses Layout for multiple outputs?