To make a long story short I lost all my pre's in a fire and my two MOTU 828mkII's. To get back on my feet quickly I got a Presonus 1818vsl which works great, but have found some great deals on used pres. Well, as far as I know you can't bypass the pres on the Presonus so therefore can't use the high end pre-amp in tandem. Is there a good 4channel interface that has 2 pres and 2 simple analog inputs (like a miniature MOTU) or 4 pres that you have an option to bypass the pre so that I am not putting a prstine mic and pre-amp into my 1818vsl pre-amps?

The microphone preamps in the 1818VSL are bypassed on inputs 3-8 when sending a line level signal using the TRS connections.

Wow really? Is that documented somewhere? (not doubting you friend, it just makes me happy to hear.

page 6 of the "PreSonus AudioBox™ 1818VSL Owner's Manual" pdf

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page 6 of the "PreSonus AudioBox™ 1818VSL Owner's Manual" pdf

Thank you again. So, if I plug my 414 into the Grace pre-amp and out of the Grace into the VSL that will be a line input and therefore bypass the built in pre-amps of the VSL?

Yes, using TRS plugs in inputs 3-8 will bypass the mic preamps and the channels become line level inputs. Also using TS plugs in inputs 1-2 bypass the preamps and the channels become hi-z inputs.