Hey Jan, we did intend to film this on the 4.1 beta firmware, however we ran into a few issues with the camera responding to speaker-track when it was loaded. This was fed back to poly and we look forward to the GA release of 4.1 for the acoustic enhancement, virtual noise barrier and support for the new teams camera control buttons!
Hi @SARIFBOYS. Yes, the Poly X70 can support 1 additional Poly Expansion Microphone 👍 www.hp.com/us-en/poly/video-conferencing/all-in-one/studio-x70.html