SnickSound

I want to build a mic preamp in a pedal, fed by the 18V line on my Voodoo power supply. That means no dual-rail (unless I add some circuitry in but I'm trying to keep this simple, and a simulated +/- 9V would be more than enough for this need).

I'm gonna be using a TI INA217 "mic preamp in a chip".
No need for phantom power or a balanced output (it's basically an active buffer with some gain to feed a mic into pedals, it's cheaper and more predictable than using a transformer).
Here's the diagram of the chip:

http://www.ti.com/ods/images/SBOS247C/first_page_sbos247.gif

So if I get this right, to make it run on a single-rail supply, I first need to generate a half-voltage reference sig