Ok so when you go to the "sources" tab it's reasonable to think that there should be a source labelled "audio input"... but there's not.
As far as I can tell there's currently no way to send audio through Resolume, and thereby you can't record live audio to a muxxed video.
This really makes Resolume a lot less versatile, it's probably easy to implement, let's add it in the next update!!!!
Or is there a way to use an audio input already, er... did I miss something?
PS: If anyone knows a workaround, please post it below! I see that some in the past have used Jackpilot and wormhole VSTs, which seems clunky, and I don't think those 32bit plugs are supported anyway now in Resolume anyway.