I use the FW-1082. I've always run it in WDM mode, never had much luck with ASIO. I had some occasional popping issues myself before I got it running nicely. Seemed the key for me was making sure that all unnecessary cards on my system were disabled (for me that was just my network card and onboard audio device).
Also, if you had problems after uninstalling a previous version of Sonar, you might wanna try uninstalling the FW-1082 drivers from your system, do a system clean and defrag, and then reinstall. Then obviously you'll have to reassign the Tascam's ins and out, but that's no big (and don't forget the Sonar plugin
). I think I recall needing to do this when I upgraded (I went from Sonar 4SE to Sonar 6PE). Things have been like butter ever since.
I've also heard that adjusting your buffer size settings in increments of 128 in the Audio options menu may help. I think I have mine set to 256. Not positive this has a huge impact on my system, but people here and there have suggested it might. Anyway, hope some of this helps.
You got ahold of a Tascam tech support guy?!?! TASCAM!?!?
Wow! I'm impressed. Tascam is absolutey legendary for their dreadful customer service. Congratulations!