Thanks for your input, much appreciated.EnemyofSilence wrote:I'd venture to say that for your setup the preamps are less important than the quality of the converters, and especially the clock of whatever unit you buy. The 2 pre's and the converters on the Apollo are really good, and with unison can get some awesome sounds - use those for microphones or if you're recording guitar direct. It sounds like the extra inputs are really needed for your keys, and don't need more mic preamps.
But while the Apollo twin has the ADAT input, when used, it has to be synced to the incoming signal (slaved)- it has no way to be a master clock to an external device. Slaving the Apollo to a crappy clock (ala the Behringer) will adversely effect everything going thru the Twin, even via the mic pre's. I have an older ADA8000, and it's ok-ish for line level signals it it's slaved to a good clock. As a master, no. And with the Twin, there's no way around it.
ya don't have to go nuts with it, but I'd stay away from the Behringer for this. I've used my older Presonus Digimax LT with the twin, and it's fine. I've also used a Motu 828 Mk2 as a digital mixer, sending via ADAT to the Twin. It's not an Apogee, but it works quite well. You can probably pick something like that up for a couple hundred, used.
Food for thought
I don't know anything about clocks. If you have the time, it would be great if you could explain what makes the Behringer clock crappy. Thanks.