A standard DI will also suffice for doing the job of matching the higher impedance output from a piezo type pickup to the balanced lower impedance of the Mic Input. Most DI inputs will be 1 Meg Ohm or more. No gain being applied but that is easy to obtain in the mic pre.
Do I need a DI if I have a condenser mic? Or should the mics pick up the guitar well enough so that I don't have to turn the input levels all the way up?
I bought 2 Behringer Studio condenser Mics (C-2) and have been playing around a bit, but the input levels are still way too low unless I max out the input levels. :(