Problem running a FW 400 audio interface at same time as FW 800 drives

I recently installed snow leopard (10.6.2) on a macbook pro 2.4 core duo. I have a couple firewire 800 drives connected. I ran into problems when I hooked up my audio interface to the firewire 400 port. I have the same problem with 2 different audio interfaces - Presonus Firebox and M-Audio Firewire Solo. Basically they refuse to work unless i unplug the firewire 800 drives. I found this information on M-Audio's website:
"Computers that have both a FireWire 400 and a FireWire 800 port may be sharing the same FireWire bus internally. When using both, the 400 and the 800 port at the same time, you may experience problems like audio drop outs or loss of connection to the M-Audio FireWire interface. There's a variety of possible reasons for this including but not limited to bandwidth limitations, clocking issues (400/800) and bus master problems with the devices connected to both ports. M-Audio recommends using the M-Audio FireWire audio interface on the computers original FireWire port while adding a separate FireWire interface card (with a Texas Instruments chipset) to the system (PCI, PCIe, ExpressCard, or PCMCIA). Connect any third party FireWire 800 devices to the added FireWire interface card. If your computer does not have expansion slots for a separate FireWire interface card there are 2 possible alternatives: If your external hard drive has FW400 connectivity, you can daisy chain the hard drive to the 2nd FireWire port* (if available) on your M-Audio Device. If your external hard drive has USB 2.0 connectivity, you can connect the hard drive to a USB 2.0 port on the computer"
This is exactly my problem. The audio interfaces work fine when hooked up to FW 400 port as long as no FW 800 devices are connected. It appears that my only solution is to buy a secondary FW interface card. However, I would like to know if there is a fix on the Apple side of this.
(note: I did not have this issue on my G5 running OS 10.4x, which is what I was on before I switched to this new laptop setup - the laptop is a 2007)
Anyone else have this issue, or know about a fix for it from Apple?

Thanks for that info, but that is not the problem. Obviously the first thing I did was check the FW cables and connections and shut down my computer and rebooted. And like I said, the FW 800 drives work fine when no FW 400 device is connected, and the FW 400 audio interface works fine when no FW 800 devices are connected.
The problem is that when the FW 800 drives are connected AND the FW 400 audio interface is also connected on the same bus (as this is a laptop there is only one bus with both 400 and 800 ports). The drives still seem to work fine, but the audio interface does not work. It's connection lights flash and will not hold a connection or process sound (there is either no sound, or clicks and dropouts). The flashing lights indicated a failed clock sync. M-Audio is aware of this issue as is apparent from my quote on the original post, but the only work around seems to add a secondary FW bus via an adapter card.
This problems seems to be a MAC issue with FW 400 and 800 and the internal clock sync.

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