I faced the same issue. There aren’t any Windows laptops made today with FireWire, I had to build a tower pc and use a PCI FireWire card. There are no FireWire to USB adapters because of the nature of the protocol. Hate to say it but the StudioLive III series mixer is the one you need, it has usb. I bought a series III for our school and I used my laptop with that for a school play and it works great. Sorry, wish I had a better answer.