No worries!
One of the projects that I am working on now is 12 zones but with 232 control.. The problem I see so far is that the DB9 port is used to link the ADCs together. 1-6 and 7-12. That port is used to pass source IR control to the equipment.. ADC 1 (1-6) has the IR connected to the DVD player but Zone 7 wants to use source control. Thus, serial commands from ADC 2 (7-12) is sent to ADC 1 (1-6) and the IR code is sent to the DVD player. I have a call into their engineers to find out if the 3 headed DB9 cable will work. And if so, will I need one on each ADC so that I can maintain KP control of source equipment while passing 232 from RTI.