Firewire audio problems with OS X 10.5.6

Hello,
I’m experiencing audio problems with Firewire 400 on my Macbook running Mac OSX 10.5.6.
I’ve got a 2.4Ghz IntelCore 2 Duo with 4 GB RAM and 59 GB available on the internal HD.
It’s hooked up to a brand new Mackie D.4 mixer with 2 Firewire outputs. The problems occur on both Firewire outputs.
I’ve installed automatically from the software update (which I will never do again) to 10.5.6. I never tried the D.4 with 10.5.5 so I can’t tell if the problems occur there also.
The main problem is that after a couple of minutes of recording the sound starts to break up and get really distorted. After a while the sound comes back again.
The second problem is that Soundtrack Pro or Audacity don’t get any audio input from the D.4, although audio input is clearly visible in System Preferences – Sound.
The only sound program that works with all 14 Firewire channels is Ableton, but also in Ableton the distortion occurs.
An example of the distortion can be checked here:
http://media.kaalslag.com/firewire-distortion-problem-mackieD4+Macbook.mp3
I’ve roamed several forums and sites to solve the problem and I tried these solutions:
I updated again to 10.5.6. with the full combo download from the Apple site. Restarted. Problem still there.
I shut Airport off, because lots of sites mentioned problems with Airport conflicting with audio/firewire. Didn’t work.
I did the work around with shutting the Macbook off, disconnecting the D.4, restarting the Macbook, opening Audio/Midi Setup, connecting the D.4 again, toggling the format frequencies a couple of times. Again, no use.
Right now I’m using my “old” Macbook again to record from vinyl. This one is still running on OSX 10.4.11. No problems so far.
I’ve had the distortion problems occuring before with an USB interface. Hoped that the Mackie Firewire would solve the problem, but it seems now that there’s a serious audio Firewire problem which is still not solved in OSX 10.5.
Any help, tips and/or a work around would be much appreciated. Thanks!

You could try using another computer in Target Disk mode (as an "external HD"), or you can connect the firewire cable and disconnect all other network cables (turning off airport). Then on each computer go to the "Network" system preferences and select "Built-in Firewire" from the list of ports and choose "Manually" from the drop-down menu next to "Configure". Enter the following IP addresses and subnet masks, apply the changes.
_Computer 1_
IP Address: 192.168.1.1
Subnet Mask: 255.255.255.0
_Computer 2_
IP Address: 192.168.1.2
Subnet Mask: 255.255.255.0
After those ip addresses are entered and you've clicked "Apply", ensure that for both computers you have file sharing enabled (done in the "Sharing" system preferences), and then check the Finder sidebar to see if the computers can see each other (their names should appear under "Shared" in the sidebar--if not, try restarting).
If the computers dont appear (even after restarting), using the "Connect To" option that's available in the Finder's "Go" menu. In there, to connect to another computer enter it's IP address as follows:
afp://IP_ADDRESS
If you're on the computer with the ip address of 192.168.1.1, you would enter 192.168.1.2 as "IP_ADDRESS". The "afp" is the protocol (just like "http" for web), and stands for "Apple Filing Protocol"...Apple's file sharing protocol.

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Complete name                            : \CONTENTS\VIDEO\0068T7.MXF
Format                                   : MXF
Format profile                           : OP-Atom
Format settings                          : Closed / Complete
File size                                : 3.92 GiB
Duration                                 : 2mn 28s
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ID                                       : 2
Format                                   : AVC
Format/Info                              : Advanced Video Codec
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Format settings, wrapping mode           : Clip
Codec ID                                 : 0D01030102106002-0401020201323104
Duration                                 : 2mn 28s
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Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 50.000 fps
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