Hi guys,
Thanks for the input. I was AFK for a while. Think I will go with the RME UC. Got used to the interface and the FF400 does sound great. With the right filters of-course
Good choice.
FireWire on Win10 is a mess. If you still want to attempt to make it work I can walk you through what I had functioning quite well under Windows 10.
There's a few ingredients that matter here, first off, you *have* to buy a firewire card with a specific chipset. Anything else causes the issues you were experiencing or worse (BSODs due to firewire using more direct memory access). You'll also need to ignore the recommended drivers that Windows will try to install for the FireWire card. These do not work for audio interfaces correctly.
XIO2213B Is the chipset IIRC. You'll also want to look for a card that contains molex power in. Even if your interface is not bus powered this in my experience can affect system stability as everything connects (leading to BSODs or the interface not appearing). In most cards, the chip will be clearly visible and easily identified in product photos, even if the actual product info makes no mention of the chipset used.
https://www.startech.com/en-us/faq/firewire-cards-windows-legacy-driver-swapEven if your card isn't a StarTech one, this is the link to use and follow assuming you purchased a card containing the correct TI chipset. This driver has a chance of getting overwritten by Windows during updates, if so you'll have to make sure it gets reinstalled. By the way, if you're wondering why a driver distributed by Microsoft gets overwritten with one that very much does not work? I don't know.
Even after all of this, it still may not work for you. Firewire as you've mentioned is very much YMMV on Windows 10.