I’d like to have a portable setup that I can use to record conference calls for work, in particular I want to cover the cases where I want or need to use headphones.
I often use more than one kind of setup I work off of, for example some possible combos for the headphones use case:
Headphones w/mic TRRS 3.5mm —-> Apple TRRS-USBC adapter —-> iPad Pro Headphones w/mic TRRS 3.5mm —-> Apple TRRS-Lightning adapter —-> iPhone Headphones w/mic TRRS 3.5mm —-> Macbook Headphones w/mic TRRS 3.5mm —-> TRRS to TRS mic and TRS phones for PC front panel —-> Desktop PC running Windows or Linux
I’d like to have a device that sits at the position of the first arrow which splits the TRRS signal out into one 3.5mm output which I will plug into the recording device.
So the TRRS is dealing with 3 channels: L, R, and Mic with a shared ground (4 wires). My main goal is to achieve the mixing of these 3 channels together into either a single mono signal or to mix the mic channel evenly on top of the L and R, as both would be acceptable, or I suppose if I could somehow find a recording device that takes this kind of 3 channel input then I can get an off-the-shelf TRRS splitter and be done with it.
The question is, assuming I only have a simple run-of-the-mill audio input device to use and I want to record my mic input mixed together with the headphones output into that device, what type of (portable!) product would I need to use to achieve this?