I am not sure if I understand you correctly. But you can transfer audio signals from one sound card to another sound card with OBS and the plug-in Audio Monitor.Hey, maybe I got this wrong... But this plugin should allow me to switch audio device output for sources? My OBS is using default audio card 1. Can I use this plugin to output some sources to a audio card 2?
21:17:23.538: Module '../../obs-plugins/64bit/audio-monitor.dll' not loaded 21:17:23.590: [CoreAudio encoder]: CoreAudio AAC encoder not installed on the system or couldn't be loaded