@LexUnity My friend says he’s used this Omnidirectional Lavalier Microphone for Mobile Devices - MVL by Shure, ($69). He emphasized that it’s not an official recommendation by RICOH. In fact, Ricoh doesn’t officially recommend using any other microphones than the TA-1. But this kind of mic works with the V, as one example.
It’d be awesome if one could get the wiring or pin out for the TA-1 plug. The plug is a weird 5 section plug. Ground + 4 conductors- channel. Compared to how much a Sennheiser Ambeo VR Mic costs ($1,6500), it’d be awesome to use the Ricoh TA-1 for other recording purposes too or perhaps using the Sennheiser with the Theta V.