Thanks, Jim. I'm putting it on my upgrade list. I see it's time to update my signature.

but is it faster than a pci-based 2496?

Firewire400 is 400megabytes/second (I think that is the unit), while USB2.0 is 480megabytes/second. Sorry to say that a PCI -based anything is around 33megabytes/second. The RME UFX (bigger brother to the UCX) runs 60 channels with USB2.0 interface and the interface is ASIO so there is no latency to worry about. But I do not use computer synths to audio files either, but I probably think other people have with the UFX they have. The Babyface works fine for me for that is all I need. In fact it is in my signature being used (probably not the best yet by me or anyone else though).

Of course Firewire800 is 800megabytes/second but USB3.0 will also beat that although right now I can not think of how much it is - probably 960megabytes/second.

And making the Doors kind of cover song that is sorta into a video with the codecs I have means 44100kHz - 16bit (lossless) but it was only recorded at 48kHz-24bit and I found out that 96kHz-24bit is better maybe a lot better. (RME Babyface recording) I am using cheap Presonus Studio Channels also, and a TCHelicon voiceworks (that I really did not use that great until watching a video about it later on utube.

PCI is 133Mbytes/s and the speed of the bus is not the only factor determining latency. 

Point of clarifcation in what Beagle and spacealf are saying in regards to bus speeds:  be sure to use the right units when comparing the bus speeds because there is a difference between Mb/s (Mbits per second) and MB/s (MBbytes per second).  A Byte is 8 bits.  Additionally, some buses are half-duplex (can only exclusively transmit or exclusively receive at any given instant) while others are full-duplex (can simultaneously transmit and receive).
 
The shows the bus signaling data rates that I collected from wikipedia.  Real-world data throughput on these buses will actually be lower than each of these indicated speeds, but it should give a general comparison of the data carrying capability of each type of bus:
 
BUS type, Bit Rate (Mbit/s), Byte Rate (Mbyte/s), Duplex type, Transmission Style
USB 1.0, 12, 1.5, Half, Serial
USB 1.1, 12, 1.5, Half, Serial
USB 2.0, 480, 60, Half, Serial
USB 3.0, 5000, 625, Full, Serial
 
Firewire S100, 100, 12.5, Half, Serial
Firewire S200, 200, 25, Half, Serial
Firewire S400, 400, 50, Half, Serial
Firewire S800, 800, 100, Full, Serial
Firewire S1600, 1600, 200, Full, Serial
Firewire S3200, 3200, 400, Full, Serial
 
PCI/32bit/33MHz, 1064, 133, Half, Parallel
PCI/64bit/33MHz, 2128, 266, Half, Parallel
PCI/32bit/66MHz, 2128, 266, Half, Parallel
PCI/64bit/66MHz, 4264, 533, Half, Parallel
 
PCIe v1 per lane, 2000, 250, Full, Serial
PCIe v2 per lane, 4000, 500, Full, Serial
PCIe v3 per lane, 8000, 1000, Full, Serial
PCIe v4 per lane, 16000, 2000, Full, Serial  

Okay, I admit that I did not look it up first and knew I was probably wrong but then.....................all that was given later.

What is "per lane" on PCI-e, for audio is only 1X factor while video cards use the entire slot and are up to 4X speed - audio as far as I have seen only uses a small portion of the entire PCI-e slot? (and there never seems to be more than one PCI-e slot in a computer, just can't do it). And Firewire if you could find any unit that goes over 800 might be something but no one is building those yet, and USB3.0 is verily out of the gate so far and I have not seen anything yet for USB3.0 either??? If you can not buy it, you can not use it, is what that means. (??) And in the end speed is not all that important in audio, perhaps in video or video and audio but just audio - more speed may not be needed. 128 bit computers in the future?? 3D TV is not all that great either they say, makes your eyeballs go weird or something like that.

All I know is that my USB2.0 Babyface transmits and receives both so to me it is full duplex and not half-duplex - (according to me) anyway got that meaning a long time ago when cards were only 44100kHz and 16 bits.