[quote author="JohnRoberts"]I suspect for a product with multiple identical circuits it's useful to avoid repeatedly tearing up and rebuilding all the individuals circuit blocks. While there may be differing opinion about a single best approach, this isn't unexplored ground.
JR[/quote]
Yes, definitly something I want to avoid. So far I think I have the inputs covered. They are quite simple, only a line receiver, a bus selection switch and the summing resistors, all on a little pcb that hangs on a lorlin switch (which is the bus selection switch btw).
That leaves the summing amps, which I plan to try out on prototype board before I make pcb's.
Does anybody know some more suggested reading on this topic? I've pretty much covered the "mixing/summing" meta's here and some articles by Steve Dove
Thanks :thumb: