OK, Robert8- "Phantom power" is required by most condenser mics, and not by most dynamic mics. Instrument inputs, mic inputs, and line level inputs are 3 different things. These days, mic inputs are 3 pin XLR connector inputs. (Most) Mics don't plug into instrument inputs, which means they don't plug into guitar amps.
The audio buddy has 2 XLR mic inputs, 2 high impedence instrument inputs, and no line level inputs. If you use an XLR to XLR cable to a mic input, either type of mic will work, but the 990 will require you to turn on the phantom power. Don't turn on or turn off the preamp with the phantom power turned on. Turn it on with the gain set all the way down and bring up the volume slowly- same thing in reverse to turn it off.
Now it gets dicey, because as far as I know, you don't have anything to plug the Audio Buddy into. It has 2 balanced or unbalanced 1/4" line outs, and you can't plug that into a computer. So now that you are all dressed up, where are you going to go? The Audio Buddy is a mic preamp, not a computer interface.-Richie