That's a great question, you cant use two RCP or Streamer X devices at the same time with RØDE Central, but you can use multiple RCP devices in multitrack mode with your computer, you may just need to create an aggregate device (on Mac) or use some third-party solution on Windows like ASIO4ALL, although for users in this server, ASIO4ALL has been quite hit-and-miss in the past. In terms of on-board recording though, you could use each device standalone and record to each of their microSD or SSD cards. With the stream, it would need to be an aggregate device like ASIO4ALL, and may have stability issues due to being system intensive, but we haven't tested that so we can't really say for sure.