Hi Peter
Thanks for keeping in touch. Lots of effort but no progress yet. Heres a quick update.
1. Not able to try the analogue output from the FF400 as I dont have cables and plugs.
2. Not able to find a Vista version of PCI latency software (still looking)
3. I bought an Expresscard Firewire card but, despite being advertised as such, it did not work with Vista. Its gone back for a refund. There are very few of these cards on the market and one is promised later in the year I believe by RME.
4. I have been in touch with RME and they suggested adjusting the settings of the Multimedia Class Scheduler Service. Under this Multimedia Class Scheduler Service you can register your application as a Pro
Audio application. This seemed too complicated for me so I have not tried yet.
5. I have posted on the TacT forum and am getting help there. It looks like there are no issues between compatibility of the FF400 and Tact 2.2XX though one person had noted one or 2 glitches from electrical stuff switching on in his house. He recommended trying a Toslink which I will do.
6. I am still in regular contact with Dell and with Berts help was able to supply the tag no. of a Dell computer that works just fine in Vista with a FF400. So they cant use the FF400 as an excuse!
7. I disabled everything I felt safe to do on the PC (soundcards, networks etc)
8. I have said my prayers before going to bed at night, and have been (relatively) well behaved with those nice people on AA.
Here is a bit of advice I just received. It should help define the problem area.
> Are you hearing a click or a short duration mute? When a digital
> input loses lock, a click is heard. When a PC gets busy, it may
> mute for a fraction of a second.
Sometimes a bit difficult to tell, particularly when the duration is very small, but almost certainly muting (drop outs).
> To trouble shoot you can listen to the FF400 via its headphone
> jack. That will tell you if the problem is upstream or downstream
> of the FF.
Finally, for every glitch, I get about a minutes worth of magic from engine#3 and its all worth it