[Geosync]

big question right now... what's probably the best way to go about using a hardware delay with 2 n12's? i really don't want to use any inputs as the returns and if there is a way i might even want to use 2 different delay units. one for each n12. im also thinking about this without the use of the computer. i could however consider the use my 01v96. in fact using the 01v's effects engine might even be a good idea.

You'll have to break this down into more specific chunks... I don't understand the question Give us an example

wondering if the 1/4" inputs and the rca inputs on the stereo channels can be use at the same time. if so is there any downside to using both at the same time?

Yes they are mixed before the gain knob (page 20 owner's manual)