Jack, First, similar thing is that both software have three screens. But it looks like there is a difference. 905 software have channels named kinda strange way, like this: G1-1 ------ G1-16 G2-1 ------- G2-16 and so on. The last channel is G16-16. Multiplying 16x16 and it looks like we get 256 memory channels. I will attach screenshots after I reduce file sizes of JPEG images. Had to upload images to the hosting website because could not reduce file sizes to under 80KB.