Have a Zero soundcard and i works. I need to attach 2 x Electrect mic´s at the same time and still have the soundcard to power the headphones. All this i working  with external preamps for the mic´s, and the mic´s are also working with the omboard mic preamp, but there is only one preamp. Do you have a card that can handle 2x Electret mic and power headphones at the same time?