If you would like to use more then one R.Ed. unit in a system (I.E. 2 R.Ed.s for 64 trcks, ect)and would like to mix with the R.Ed. mix/software. Unless you have 2 Mixpanders (1 per unit) you will have to make a physical connection between the the 2 in order to have a common bus the travels between them. Does that answer you q, mate? any others?