I've been running 3 converters, 8-channels each, with separate cards since W2K...through XP...and now on Win7.
I can use them either with ASIO or WDM...and never had an issue running all three simultaneously., but they are all the same kind and use the same drivers. These are PCI cards...and probably my last build where I can still use them, since few of the newer PCs have three (or any) PCI slots...but this current Win7 box is good enough, 3 Ghz and 16GB ram with quad core extreme processor...it ain't no slouch even if it is a few years old.
I've heard other folks talking about issues with running multiple interfaces simultaneously, but I've not had that problem.
These are older Echo Layal24 boxes, and I'm running them with Samplitude ProX. In the DAW, I see all the boxes, I see all their inputs, and everything works fine.
Why doesn't it surprise me that you would say preamps are not really needed.
I dunno...maybe your use of pres is different, but I find that regardless if it's a tube/tranny deal or solid state...there's all kinds of different flavors you can get with how you set your gain knobs on a preamp and the interaction between the mic and the pre relative to that.
So just to be sure I understand you....you're plugging your mic into a Line input...and then jacking the gain way up high to get enough signal from the mic...???
So like, if you put aside real loud sources where you have a 100W amp dime'd...what do you do for acoustic instruments, vocals, etc....where the preamp gain is critical...???
Hey...if it works for you,
...just sayin that the rest of the "non-nuts" world finds plenty use for preamp stages.
I'm waiting for the day you talk about a solid copper wire going from your guitar to your DAW...and where you've removed every other piece of gear in-between 'cuz you don't need it.