I think this was briefly discussed either in this thread or another, although I'm not seeing the discussion at the moment. I currently have both a 680 and a 680MKII, and I often run the 680 as a slave of the 680MKII, to get (depending on the setup) 10, 12, or 14 (with external ADC) total channels. Most of the time that's fine for what I need, but sometimes more channels would be helpful. I'm currently debating getting another 680MKII, which would feed into my existing 680MKII and up the channel count to a max of 20. That is:
From: ADC (sometimes) -> 680MKII -> 680
To: ADC (sometimes) -> 680MKII -> 680MKII -> 680
I know I'd have to manually start and stop the first 680MKII, as the cascade function only works on a master/slave pair, but otherwise it should work. My question is: has anyone tried doing so? Are there any issues with the clock staying locked through all of those devices?