I did search and can't find anything relatively recent that addresses my question. Someone asked the same question in 2011 and there were no replies. Anyway, apologies in advance if this has been beaten to death already and I'm just not seeing it. I want to record video on my iPhone 8, but not using the phone's built-in mic. I want to record the video with the audio coming from a STEREO line level output from another device. Emphasis on STEREO line-level audio recording to accompany the video. I can find devices that claim to do this but they're priced around $150 and up. My requirements aren't that complicated. I could record the audio track on a computer using Audacity and sync it up to the video during editing but it's kind of a hassle. Mono-only adapters are about $20, but that's not what I need. Ideas? EDIT: The audio line out from the source device is unbalanced, coming from RCA jacks.