I have no experience with ASIO sorry, and CH does not send audio via NDI. My dabbling with streaming i used virtual cable software to send mic input to Ch and OBS (not CH to OBS). If you need sound clips from CH (eg from a replay), maybe look at some of the virtual cable software for your OS. They basically become available as a virtual speaker device, copying the audio sent to that "speaker" to a virtual microphone device that other software then listens to. I don't recall which one i used, but some allow multiple listeners at the same time from the one source.