Of course, for adding to the capabilities of a VT system, regarding *on-screen* preview, BobFX.com may well have a solution worth your having a look-see.VT[3] is a 3 channel video inputs board. you can see only 3 video inputs even you have 8-24 inputs in SX-84. SX-84 only pass no more than 3 videos to VT[5] at a time.