Viewer audio problems with Desktop Cinema Preview

Hi
I'm using Destop Cinema Preview to output to an external video monitor from the video outpout of my iBook. I'm using a non-Apple patch to allow screen spanning offering me a full screen output from Final Cut Pro (not simply a mirrored desktop). This all works fine with video playing nicely on the external monitor from both the Canvas and the Viewer.
Where it often goes wrong is with the audio:
1. The audio in the Viewer is delayed and sounds like it's at the wrong sample rate.
2. Once this has happned in the Viewer, it may begin to happen in the Canvas.
3. Once it's happened in either, it won't stop.
4. Re-booting FCP sometimes restores normal sound in the Canvas, but not usually the viewer.
I've tried altering the Audio in User Pref from Low to High. This worked once. The problem is the same across different projects. I am using 48Khz in each case.
I've checked System Prefs in the OS, and there's no issue there.
The audio is output-ed from the headphone jack to an external amp, but shows the same symptom using the built-in speakers.
I do not have this problem when hiring in a deck and sending both audio and video out via Firewire.
I don't know if this is relevant, but I am also having problems recording VO through my MBox via USB 2.0 and into the Voice-Over tool.
Any help appreciated.
best
Aldo

Well folks, I took your advice and bought myself an Canopus ADVC110 with which I have a number of issues.
Here's my setup:
Firewire 6pin at the back going to my Firewire drive which goes to my computer (all faults below are the same when I go direct from the converter to the Mac).
Rear S-Video to plasma screen monitor.
Rear analogue RCA outs to amp.
Issues:
1. No throughput on the DV. ie if I plug a camera to the front 4pin Firewire, I can see the pics in FCP, I can control the camera, but I can't get FCP to save the captured file. To do this, I have to unplug the converter and plug the same camera directly to the Mac. I'd rather keep my setup, set up and all connected to my monitor.
2. The S-video output has a latency of a few frames. NB this is not an FCP issue as everything is in sync on the computer screen and both video and audio are leaving Apple's world via the same Firewire output. It's how the video and audio are leaving the analogue outputs of the converter that is the issue. Somewhere in there, the pics are getting delayed.
It's not a monitor problem either, as I've tested this using the VGA output. ie When my plasma screen mirrors my desktop, it does so instantly.
3. The analogue outputs are really noisy. They have a real sizzle. Again, I have tested all the cables and routes (replacing the ADVC110 with an iPod), and found there is no interference in the system until I re-introduce the ADVC110. I have also tried adjusting the DIP switches after powering down.
Has anyone else encountered these problems? I'm awaiting word from Canopus tech support too.
best
Aldo

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