Yeah, I knew once I had replied that I had got that completely the wrong way around! Thanks for your patience terminal3
Alright so I would need a new interface as well as the preamps if I want the flexibility to record more than two mics at a time. Let's leave that for another thread!!
And from what you are saying I'd be better getting two (different make) 2-channels pres rather than one 4-channel, right?
Let me research your suggestions. Thanks again for them.