Internal SD Memory:
The BR-800 has the ability to record 4 tracks simultaneously onto the installed SD memory card. This will be audio coming from inputs 1 through 4 on the back panel such as microphones, keyboards, drum machines, etc. The following article will guide through recording 4 tracks simultaneously:
BR-800: How to Record 4 Tracks Simultaneously
USB Functionality:
When using the BR-800 as an audio interface or control surface, all incoming audio connected to inputs 1 through 4 is mixed together and is seen as a single stereo audio signal in recording software--the BR-800 will be seen as "L/BR-800" and "R/BR-800" in software.
Note: There's not a function to pass more than a stereo mix from the BR-800 to a computer in real-time. The ability to record 4 independent tracks simultaneously is on the BR-800 itself. However, after recording 4 tracks simultaneously on the installed SD memory, these 4 tracks can be transferred onto computer:
BR-800: Transferring BR-800 tracks to a Computer